Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8eaf42004518d7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 02:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9db333cf6dbb32db7fb06d4438a52d2 SHA-1: ee8e6008ca5069b3fc0b2431f088a6681c971454 SHA-256: 9f8eaf42004518d7215f92597f591ca4f91201d1972a218f7e9bfdea14c1e41e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO poisoning. The heuristic firings and ClamAV detection indicate this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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=pdf+reader+for+windows+7+download+free PDF link annotation
    • https://essuances.com/ckfinder/userfiles/files/lazimivibopeteru.pdfIn PDF document text
    • http://aimic.com/userfiles/file/dinivusose.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f4dc451ba7cf3c1b6993cae1653e0039/68409920460.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/17915550446.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/62569256872.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fa74feffcdecb3da78f9c74f210c0161/xajiminurakekotinot.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609024d1856a5---86490895732.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/bemabavajunutakifugo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/nunagikej.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8a130ad9afac7ed5625c7c7998d44c22/48946606029.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2fd2bf5ad76212715a75e130eee09635/lozofalu.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/makadepoxovogipedepames.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/45393267372.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/89311934405.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bufidida.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/13714722719.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/104108330560b06ca9b697a.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c9610895---zimadalovupizulumuzug.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43548a352a---10442875281.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4318a2693---pelawevojalunalodirijaz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0n0jopm6g9ni6ns317ct5vvtj5/pukojal.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10384 bytes
SHA-256: 4eb4a8be26113b9d2e502a9fefe6feff975b8155201e42f60f41d56fd605ee02
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 19080 bytes
SHA-256: bb51757bed37058b29f166caaf61cc17b42270e5ce719ebb81e3b54fd81ac892
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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