Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee36699c9d7bcf9…

MALICIOUS

PDF

94.6 KB Created: 2021-06-29 02:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a95232962c41e3172a18c9be91caff95 SHA-1: c0ecf0cdc0a452a2fbf5b57c74e176ae322c2ba7 SHA-256: dee36699c9d7bcf9c39f8f8d00d67cbacd22fe8480723e5f12bb94d99eb05cae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through a network of seemingly unrelated websites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=simple+wise+quotes PDF link annotation
    • http://gld-lining.com/user_img/files/sorobavivodedadatepoteg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9c1ue5p4a6h1nel7jnsfotrot1/pivije.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160771a31effaf---ribivubepixejekelivazaz.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/fubev.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/66871265370.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/xuvogudovavuwud.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/fukunomivumomazuvuriw.pdfIn PDF document text
    • http://liyangah.com/Upload/file/37864054354.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc48cd9e3---tadopajafirudililejuj.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623330927.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e6a6eda---68659959874.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/dakaziza.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/4361486035.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160751c62b4729---76274451728.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609369e4c64cd---2900618834.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/65897723299.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf5e3715d---10469122539.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ssscldnl3oqbvhrggbakd7vvl0/nevezowutatibor.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fecf6b2841---fataxinazojut.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3pe9ehf8ad3u2uj8fj9ca06454/26144426657.pdfIn PDF document text
    • https://asiabiru.com/contents//files/xidagasatajusidi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/41a5bce2b5a33fef9c64164a9ee13552/18866769899.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b37cbdcf3a5b6fbf32ae3b950aebe49/sadoxafezupower.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/kulb73hqu0ofs1m6ekum0v7i6g/fakirijuxumuxerer.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/pufivizudamaf.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zexafexobigawozeg.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/maseta.pdfIn PDF document text
    • 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_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16620 bytes
SHA-256: 1697810065ce00b6a8884736968ec6eb8a5f97773ead00745c4182a5c0fb780c
font_02_sfnt_off00015425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15425 10456 bytes
SHA-256: 87e92f958344877e6c3c53efa1a48001e34bf43f67fc2a3833c9a70759e16b4d

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