Malicious PDF — malware analysis report

Static analysis result for SHA-256 946a0f939dcd04f2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 17:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a0906a580c6f120706b22980c8968f9 SHA-1: 767bafa05dab7285e2493fc04d91bb416c46aaeb SHA-256: 946a0f939dcd04f227fa7cb399a6411c6d91172b41351ebbc8edd0d66e53a175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, possibly related to a sale, to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=extra+mega+sale+2019+flyer+pdf PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098deacdf57c---56857874807.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3a14f5f2b3c5bc0fd87b8e19beca9803/farenuw.pdfIn PDF document text
    • http://tochuchoinghi.org/files/76528071304.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/71111912382.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/tamanaride.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/7086219800.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/guwatovupa.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210821040030_p1ygl6.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/de9hjnjlj6h118pptjbtot74md/setodoxuwexifenavutum.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/togolutanadimevuwosezutul.pdfIn PDF document text
    • https://clove7.com/userfiles/file/fovimi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/wezugiviveporitufaputo.pdfIn PDF document text
    • http://roocenter.ru/upload/file/89835257031.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107040212.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c2a4620cf5e08147ecb026f42dc73a13/tesavekojunemepegep.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/42829085673.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/95216105837.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wifufaga.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sb6rhho7tu9kf24dj7v9sbtskf/xukuwaki.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/pezeguxagelo.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/63313293594.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/65042199220.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/mezunevozedonubulixo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717fd0b8949---30003685480.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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 14656 bytes
SHA-256: 0baa7dd97385e2acdfd1cfc146db16ac95eed9fee0a9356a9714d6a702ea1aca
font_01_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 11188 bytes
SHA-256: d504053866e9d014600379a143eee3bd5dbc7d9ee317a8a27abc28fb6f43d000

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