Malicious PDF — malware analysis report

Static analysis result for SHA-256 09391aa32063aa33…

MALICIOUS

PDF

71.7 KB Created: 2021-06-17 23:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2806f73d17eb8cfbf33763514d29a1c SHA-1: 2882e88b9753289f2126ac17c241ec3ff83d179c SHA-256: 09391aa32063aa3353a654c9d69618a6fc5f3727880fae2706142e179f52f313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation attempts to deliver a second-stage payload.

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 http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f823a122---85647109484.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef030edb8---78491327640.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8945f59b35---36923037016.pdf
    • http://kfbi.ru/content/file/32729851601.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/20lr57s06ammqlcustrleppnt7/tusowobu.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec253109e---30127010816.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/5720702633.pdf
    • https://lacecinella.com/writable/public/userfiles/file/15673268597.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2185ad48fc---zukegavix.pdf
    • http://sergey-yushkov.com/pict/file/68450532190.pdf
    • http://aaaexpressac.com/userfiles/file/89583089015.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af3fa74d176ef1f390fbcd4ff075f03f/bigexu.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2391b554---33225620122.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4979a448---58390405256.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nbm4cc63q43gs40q5iejoc8o8r/32588434940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+put+the+echo+dot+in+pairing+mode
    • 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_off0000dba7.bin
e08312cdbcaa4d2381a7806b2bb7e3f9acd06ab67960f0b07aed5157e0a23134		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 5328 bytes
font_01_sfnt_off0000edae.bin
32defbbe6578c616c802be860b9d71e5017af727ae97f68cc7a28fea8bc8f854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10480 bytes

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