Malicious PDF — malware analysis report

Static analysis result for SHA-256 255914a6d8011324…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 06:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5faba00f18783b45f7b77aff5b276740 SHA-1: 8c1a65c76c8bbb6219a6149448950c6f044313c4 SHA-256: 255914a6d801132465c47b90cdb436c9d8d28a8641531645613231e43a045b51
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal numerous links to external resources, including a raw IP address and compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48eb141b28---xoxifomevig.pdf In PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/zogokegonojenuveloxarupo.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a4401edcedbd82884e3139dcfd8b3e32/79386699023.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72588a6d9d---lajufoxadekojepar.pdfPDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/32f4218508809294e270c4e8f9c1cd01/ludugukudisoz.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/84811479768.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hdhvk1n8ar7bgim7d12lk514h1/laninobobunijasokoxib.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/45612437168.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6v6b4ff6cd80dfjk4995n7urgp/wajam.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d09d04a696600535119d106de8861acb/karubuvikilutanuwom.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a449f3b158a---zuwamobekexomofetebezan.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f0f4be3d8007359d5761e287c63bbe7/93567532630.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a387f867a6---36492397342.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc148bcbb8d---84878006308.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/tekelud.pdfIn PDF document text
    • http://ministerium.pt/files/kazavovetesevu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/32842496680.pdfIn PDF document text
    • http://186086.com/upload/files/nusufuma.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612c06e529aff---71839807736.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/82860895323.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/mirawukopu.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/48077811703.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xazupakinovos.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4beaba25d---dawuvuxelepoxu.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/gabimatonoxamizerurozaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=calculus+3+pdf+jkuatPDF 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_off0000c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 10588 bytes
SHA-256: caca385c4f7768d536bb8420f02f007a43ebcae4e7a21632e18bccdcf9a6df32
font_01_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 18184 bytes
SHA-256: ff20747606c31eed3c894afdabd1da86dcfa1ce478a3c2be7b3707b8b6f2049a
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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