Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b19bc0de4241a6…

MALICIOUS

PDF

74.5 KB Created: 2021-05-25 18:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5b24482ee40cc55b739527d80a8829b SHA-1: 8a7ce4981806c5d75076005a704c1be3d440b25a SHA-256: e1b19bc0de4241a6ce38ad4fdaaa9774b3c9511e07dbe679aed25147ed4eae46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, hosting numerous PDFs on compromised websites, which is a common tactic for phishing or distributing further malware. The embedded URLs point to these compromised sites, suggesting an attempt to lure users to malicious content.

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160794259d7b30---logamubidewaxivi.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/06f55a3d43437dc7f6da5e1cc6ca4b5d/22747907570.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5819879f---28559782464.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920744e0b3c---deliduzal.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab173de8cda---80185258044.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2b0ecf51491edaa261e524a6adf53228/61063815475.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/cn63l1rnjbtthkb8dk2h3a1543/kizozudiliwuvu.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a4a45b72---48032774607.pdf
    • https://angelsstaff.com/uploads/file/19788526159.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/670pqmd0ik6361atr6vj4kh80q/pazakebekem.pdf
    • http://ash-graphy.com/userfiles/file/xadopupufofojixoriwobofi.pdf
    • http://adamlegal.com/userfiles/file/lesezejim.pdf
    • https://notrepanierbio.ch/userfiles/file/83097065414.pdf
    • http://www.bestofsherlock.com/top-10-sherlock-quotes.htm
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=does+irene+adler+love+sherlock+holmes
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e737.bin
2e3c8d85f9311d28f4dad3af629ad96ac37ba679fa17bf95cd7a480629cdb6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 5304 bytes
font_01_sfnt_off0000f91f.bin
4a09e0c67fd609369f73e012655208a6c7a57ab527146885690cb2ff39aa0290		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 10624 bytes

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