Malicious PDF — malware analysis report

Static analysis result for SHA-256 afea939d5a30e66f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 05:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5725c05c998ccfbb60f45f16d78f1c4d SHA-1: dd2a1759cb103a3e2569738660107213918a23e0 SHA-256: afea939d5a30e66fada491967f3f1f71479c2fbcaf02f80c3a13e44a7c1147e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable or potentially compromised domains, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lensmam.com/userfiles/file/zukokumivikupalinej.pdf
    • http://creative-format.com/upload/editor/files/gufinozomuverowagar.pdf
    • http://salocchi.it/userfiles/files/zazirawibor.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/96e4a6af4eef53639187b7751aa453be/sagenepotujazo.pdf
    • https://masukpt2.com/contents/files/madogefala.pdf
    • https://habibitours.net/ckfinder/userfiles/files/44017124921.pdf
    • http://www.og2c.com/images/file/81164370200.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130614ac01c3---zoruwafepu.pdf
    • http://skupka23.ru/upload/m/widurerevatadelesivoxome.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/22750352512.pdf
    • http://usaoxin.com/userfiles/2021-9/file/towufe.pdf
    • http://crabandclaw.com/uploads/files/34437853325.pdf
    • https://kalimati.in/userfiles/file/pupajozogawedorofaxis.pdf
    • http://allamericannursing.com/userfiles/file/70237936815.pdf
    • http://s4l.vn/storage/ckfinder/files/56110141804.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/mitanibodisaleji.pdf
    • http://space-edge.com/upload/files/rafaxidavowas.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/jegopudezejid.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161451b8b8faea---dojobiruletife.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/bilikixi.pdf
    • https://aletihad-group.com/userfiles/files/96082810782.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/baroxemijamodo.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozotujagupatizusilasa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fnaf+6+apk+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b272.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 16792 bytes
font_01_sfnt_off0000ca84.bin
3c36abc185dad7449a2a8c260836aa6886c318682967cb6f3f0fbd946f84cd17
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 15744 bytes
font_02_sfnt_off0000f295.bin
8be79474d1d745d95d2dcb58d77c762591a2e1ad63c31769e67059f6b8577064
pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 10456 bytes