Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdffd47ea46fc135…

MALICIOUS

PDF

88.2 KB Created: 2021-06-20 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 49029d8f8e29c9eab1c64780c4740112 SHA-1: edaae04ab6fa7d5ab6e0607a71eeb4fd26079181 SHA-256: bdffd47ea46fc1354afdd5e8fc200dacd3fcea75c32892e417426ad01bd72cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The document body, though partially corrupted, contains keywords related to study material, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=kas+study+material+in+kannada+pdf PDF link annotation
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/p4ukg99d41g59er0mauo28u82u/53982792604.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ffa5928f404ed47bd94775088d6357c1/8874681372.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f10f0237---87306899943.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/14302500000.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/meduxigibumafaragokefofiv.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xerefirisufun.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9utk7702j1d3k0nglm0lhft4e7/kewuzorutuzujoxim.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/19407013907.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ri27klgfd8nkuko941bh50quuo/funiz.pdfIn PDF document text
    • https://mfdesign.hu/files/file/2391965930.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9b546b1f8906b3b19af130f510106d3a/kafug.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd70446129---34072867396.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4d99a45c---71605202327.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4995864234.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880897f53b---rilel.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f008c3e5---74926671120.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f790.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF790 24980 bytes
SHA-256: 096eddb8844b0d0a2e91be3a2400b698cdebaca74d9f018b1adda025ddd23f39
font_00_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5324 bytes
SHA-256: f048966c3df631abeac4c524add9411210a68d459c50fd6f24a7ea4967415fbb
font_02_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 11552 bytes
SHA-256: 8e7cd9d79254c098a7df3cd589f55fdab3ea6e14832ce059ff9e3d3a503fcd75