Malicious PDF — malware analysis report

Static analysis result for SHA-256 d969d3b54c3ed0cf…

MALICIOUS

PDF

89.0 KB Created: 2021-07-31 11:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dce0117f45c33f4067e7f8c08d70931b SHA-1: e4bee0c4b617d3753ebe62ad6279c2dbbad95374 SHA-256: d969d3b54c3ed0cfdbadc1f5d19033cea1ac7ad7680e51c28e3171474e11f534
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=achieve+3000+reading+levels PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05dcc3b23d---vaxawefavunasunomoxodew.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/ginopipemudikirebosu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa009a116---6985705046.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/29690673536.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/nosafubinuboxuwegirel.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e63a8afc4---tipewu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8sose6fldi4oh8vg3mt1i0ipo4/38735164942.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf89b7ace6---wofavuwinopo.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160745f601e18c---74063498264.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6fce23ec---gulotabot.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/eiedhi3qcodcolnleqq7qhnqvr/zepivosolugivaxuse.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f472696cc---savukafo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c8943dab14b882e0ec2c818500b17492/bugigutomil.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pa8s0bbb53b29phi8vsjl9pod0/memurutiv.pdfIn PDF document text
    • http://vswet.ru/f/mefegexevaluf.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/81146457544.pdfIn PDF document text
    • http://sireny.net/share/files/kesozitozazavevopezusoki.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mepoforivatuloxitu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c9af4dfe432192fed69a92a2410b8b77/wipesa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/144514ea58610111df1d1751ce5a9347/19849162562.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/27089448294.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/43066637973.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0a099b8f---32002440656.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_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 18028 bytes
SHA-256: d1b8e17d20c36c95075cd20cf988b7f8c87059a1c783434d24693b3cdd1f737a
font_01_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 10772 bytes
SHA-256: f171a8c6d621b9a98c6360e836f2d38c5b0c77eb684adf6986fa73d7d54398eb
font_02_sfnt_off00013da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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