Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97ceec9c8f99e15…

MALICIOUS

PDF

63.7 KB Created: 2021-05-07 04:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2dc73c6412a742bf408578bfd00cb4 SHA-1: 2029279d2a058200d291e9c8df15e8f56514370a SHA-256: b97ceec9c8f99e15fbad5db0dfbc6123697848908a7e35ec439acbfb747eb66f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links to external sites, some hosted on disposable domains or compromised CMS uploads, suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8680

Heuristics 5

  • 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
  • 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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f922b4bea8---podabebogekawe.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed44d814b---gagasofipigopav.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/iq1mbvpkabgs15que1pf25lbeo/52724746660.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9fc8d5221930a2dfa26e05f0fc4d945e/donimiwuxul.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/01827101de422881fe46d605f510eb65/dafanu.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e486049678a592e3fe7640069838d679/59364098349.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/79jk8uc6uprg29oouvn08h1dg1/20350739984.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607136e939350---21537704452.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c469d2467ffccb8e45ec07331af29f51/kumegeniw.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kpcngr88dbcl4m80dpd7a62fe5/sifasaxovogonabixuwug.pdf
    • http://simonide.org/userfiles/file/71247366656.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6c20ed51741c68aefb678855c3fc00b6/59404222630.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607566626a3cd---81374263053.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dr58nclub7ld1p953da8skjjor/xuzifesasakofakedinep.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c69b1b6d9---vemenud.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/o7eietriv0p2e03rk0kudf58uh/72593320730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=celebrity+quiz+questions+and+answers+2019
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e213.bin
c76774419569f6e3b62e85dcc055455d0c2f2fbfd915c7547860299e4b06c36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 5716 bytes

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