Malicious PDF — malware analysis report

Static analysis result for SHA-256 3534e420fc29dd30…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 12:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09e8547ee861595ff59e3bf3f55bc62e SHA-1: 8e3f6b46c679fcfd451712a7de12993a3c65e3f4 SHA-256: 3534e420fc29dd30f926ae4259d940fe3ee75fafcb67ca41cf8c7fa4a2710f9d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94ae04977---sibalox.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9m2ivltivp096ug9gqmtij91o2/52642516765.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/50771386205.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/gezabateli.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/jubaduxezozanemilegiwizo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/10367646272.pdfIn PDF document text
    • https://cncunse.com/d/files/29029327253.pdfIn PDF document text
    • http://domplus.su/userfiles/files/79613266418.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/muvimofomad.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138c5574978f---51902539752.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/18670772609.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/jalivizilo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11593a820---2814246773.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/14316352807.pdfIn PDF document text
    • http://4rrecycle.com/files/file/90649757870.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311482836819.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/wasanusogojupino.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/47499528906.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/75873586011.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/38263734957.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb1048619df38f7e694bad191829c7ec/29996809010.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/69821723804.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/97558890855.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/23001924887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+10+emulator+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 10764 bytes
SHA-256: 24c9ae7ada422d4ed4f771dfa63488e6f2a6bc9b12c3603f1031bb95b08fa9a0
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 17424 bytes
SHA-256: 921e27f181efd11393a0e04e7c8c648e3033d8efc226d9c3fb20bb2e891a1cbe
font_02_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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