Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adf1c903c86a6c3…

MALICIOUS

PDF

75.3 KB Created: 2021-06-14 00:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0edf1520a50eb45685a856ab80032e2d SHA-1: b7e2fdc201436c9b7425df22d01191b1d86d378f SHA-256: 5adf1c903c86a6c334f3619550ed336446f9bc1d4666a954c5a3ee587bdd6e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for distributing malicious content or phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards attempts to redirect users to external, potentially harmful sites.

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://smidgel.ru/uplcv?utm_term=how+to+make+a+sheep+rainbow
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98b2f260b---tavatekukezaxinunoloku.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3abc2d966c4ce55e75c57eb5ccf65a54/58576828045.pdf
    • http://builderall.info/userfiles/file/51946594023.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f941bce797---bugidot.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5c406901---72173214981.pdf
    • http://uniquecharacters.com/upload/files/53244296023.pdf
    • http://dlt-nkp.com/fileupload//file/69092685784.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/losexiguwipadoxovativap.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/388c6bc2512d65d704ef28d88e6244a6/risokudinavevatol.pdf
    • http://chinalabware.es/d/files/bebabewij.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48cfe0d994ab475c5ca1200709336fb3/xipiwulonujibizimateb.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0297c873---geregapomezodisetib.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2137b7af3---61407535274.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52281fa9---xozuwamar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e930.bin
f36d6b927a2a1c648e7e1bee36a14fd2c9cc312808030ab60c7e5f0e359d1db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 5284 bytes
font_01_sfnt_off0000fb03.bin
ff8e09d4c61ddeefdf8d77d287504252550f713ca657e57083cc2815ca92184e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10984 bytes

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