Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7936af284acd1…

MALICIOUS

PDF

70.9 KB Created: 2021-06-05 07:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3f836f4517fc6eb7f5753030ca10ae3 SHA-1: cba79c41ff11a6c84218d87e80e5753a24f316bd SHA-256: e6f7936af284acd1199f6ee99b97bf855629052fbb3552f28d93701af5850ba7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The document body, though partially corrupted, appears to be a lure related to transformer sizing, intended to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

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 https://pixomot.ru/uplcv?utm_term=how+to+size+three+phase+transformer
    • http://webursitet.org/Files/file/61729301148.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f638bccf---64715331746.pdf
    • https://meganimal.pt/site/upload/file/11005377813.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6e7e111d575f0c333a74403d220f61e9/70530736336.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kfgbs608ij1bc6spv1edjgujq4/jakilomoneleka.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qiaugk3t0utfvot1te656ku668/35206923970.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3pk9ietqu22u9gdh2cfi618g6n/53274324545.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a66c6b16c---56699062737.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3089705e23---fonirotebabezumawuvi.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ed30325---gupupoko.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8e0m8klus2nbc7vi7bevmm2jos/93677432109.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2d3c90ffee0c54c7db4146ec6f4a59a9/pafezosuparudumopelojaz.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/se1t1915nvvctuhej8olfr0e2r/ganefabubeze.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/98ddb2fc694a40218818e27ebda90a0d/tazafupelewanumixegudil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0a.bin
83cddb964d9bf1bba7dfb08e79531352a85bb4af520e99d2d4c5aafaa920718c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 5000 bytes

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