Malicious PDF — malware analysis report

Static analysis result for SHA-256 6911a1db7d0c375e…

MALICIOUS

PDF

106.3 KB Created: 2021-07-05 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24c0a9d248db75bf333546b266015d97 SHA-1: 48ca7f9ae618e2b5d2f029019e06831e43dcfecf SHA-256: 6911a1db7d0c375eac2f5171c0c63fabdbbf6f2385e59a07fa75b65c242303cd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or distributing further malware. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://falconartistmanagement.com/ckfinder/userfiles/files/ninotalefev.pdf In PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16934026597.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a5eb2056064711c2b49c0d5f59aa3576/daxegekategi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd613485fb---17485868691.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8545d99d965d222ea9367f8841450653/18284626852.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/rokuvete.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a5e9885f---90489497424.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ea11d385---luzedizilazuxem.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/73529055495.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wemovaditugaverazimasom.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/90374656564.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609299c533581---37700103783.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/43fc877740d85f500bad4bace4089bef/tetujejovorikixidet.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/difikuvoxibozid.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/62927825149.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/41343763833.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb636a38050---30952941418.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bae74356b73---tipawegejegofimap.pdfIn PDF document text
    • http://podushka.by/files/files/69031357757.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/usfa95598ps7v3l7iljsr1odt1/98027591134.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/44791873285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sonnet+13+by+william+shakespearePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 16368 bytes
SHA-256: 1957c7158e46d2a1fcea66bafa400ac9ebca94e16e515df6fcf3dbaa0e857b8b
font_02_sfnt_off00015700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15700 11248 bytes
SHA-256: f6d2ae09f454bcd62301791d50f2e589cf12236e4d8e83e9157b33fc0ac80f3d
font_03_sfnt_off0001711d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1711D 16500 bytes
SHA-256: dbab0a921d943cbac0b1c8a6a40930d2ff304a08030d322f67250391f63fb96b

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