Malicious PDF — malware analysis report

Static analysis result for SHA-256 998fcd654ef39827…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 10:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8ae4d63c1c3f5fdf14ae0bb7463b68d SHA-1: b985d99eb6a54db6f512606f56144e3a0592f09b SHA-256: 998fcd654ef39827c3cef42e01b80d95217b49282adc2bfbcaf6d8f75e985914
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=songbook+piano+pdf+free PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d222e35f77b---tuzinolisugop.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/22767774928.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6bc810164---najudexilofixafizanik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd844c9da3---39702461867.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/7130038090.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396843766e---zadapo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pasirijoji.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4f5fc506ae72e61267cc516577c1cdd9/45716185255.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/96517046272.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c67a1891020---45033131989.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/26de5fb3ee5b96744df44e6214531980/20587614530.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/61782115213.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/50870825051.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2348141e---66714730293.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/pomiwelolerosekovugobefad.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610a46ae368c4---tuvivunuvanaf.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981f4ed---54198293791.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da9adeafa---bujepiliko.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/46391030307.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/519394b11836ba15e85f4d88d6cf70bf/95049193435.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/39105801703.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6421af21c8---bepefokegagotar.pdfIn PDF document text
    • http://bdn10.cz/files/file/23644235020.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/982fa8bbbe63cd0840cda3b93b04ceb1/67909837299.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/gewiwi.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 10668 bytes
SHA-256: 925b5dff3c75d126d84abc9725ca826a26d69ac2ffaede5d31479990dc2dec7a
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 17580 bytes
SHA-256: 68d437ec0957ad6e1170576acf88d2cd50e1e2ff0f4c1397fb46421f56689ae6
font_02_sfnt_off00012ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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