Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc044d78bf1b8f28…

MALICIOUS

PDF

91.8 KB Created: 2021-06-27 10:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b51fbc41d2877864ad350ea8ea99b38b SHA-1: 5fc18848273db0afbd8a4290e2bd8183ae2b7f2a SHA-256: fc044d78bf1b8f28e030e5d5d97571b4bf486b9740ad7b4d937e1c6c06e0eea1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://evevoyance.fr/adh/.-/file/54545382354.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f7af47fa742d10b67cdc74b40d4fefb4/80742212970.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fe6a63e3c---wogekazapezukoziju.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201c5690e7---mevununowef.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/88470243035.pdfIn PDF document text
    • http://gistys.com/userfiles/file/14908917013.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a4872729---livugoxupe.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t4lf8fd97fpvupu2tke89gbqvd/52741538313.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/28733493137.pdfPDF link annotation
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/355c42a04aead2f8c2d32eb09e8c6093/jaduzelatamejozobugaxeze.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c5qb0fc9or54npnlrsm8l1n034/miseneparivewak.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ao3l6pigfk6q76ueslebdbpa7c/71808474131.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160842ae84da74---wevuz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1007eec0---32289551412.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bizulawiginaditinalowux.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/tobinalebalisekobupidujog.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b76427c1b10---22992622904.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609771311aa3a---karazoxib.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/voxizemikak.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bokarimowexarafiraja.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166fc02312---falajafonedabob.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9ej7mme1soj7eror6ko8v07jid/nanatazaxekokesubisukeza.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/92985495219.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a41add060d4---bamutelogimusal.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/777909c3902bd7e98b2a6406df17e272/mavododubonotarekule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+draw+caricature+of+a+personPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 18676 bytes
SHA-256: a9573cb10864a83fd5e664435db4bb847f14e52b3f7636c02ac780dc9838ff80
font_01_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001474b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474B 10744 bytes
SHA-256: 05acf3aadf3cc7ec197f67bf7e2694af2bdb3ffb286ca0f3ffb464f962991bd6

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