Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef01df819c06ad45…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 15:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69d5153f13a3003fe34281ba983a7b15 SHA-1: e4cf9fae89c87ce879bf6f13f1b2c23835e00372 SHA-256: ef01df819c06ad45901511c4cecccf884406d9d9cf3ce68df5568f9e5c3673f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=earth+is+located+at+one+of+the+moon%27s+orbit
    • http://0965818789.com/CKEdit/upload/files/73066461367.pdf
    • http://www.cbs-emballages.com/upload/file/xutefaxum.pdf
    • http://dioceseofniranam.org/userfiles/file/68808585441.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/75361174243.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/70ee9c7eab56f6713db6c74d6d7c3638/56204754110.pdf
    • https://brahmagnanam.org/fck_uploads/file/83492564802.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c0f84fcc9076de37891ba2c70ded1472/wagixugokuvemubokozesoda.pdf
    • https://dcoderesearch.com/uploads/5550954778.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed4a729bd---rumex.pdf
    • http://bahattinburyan.com/userfiles/file/11203254722.pdf
    • http://myjobcareer.net/userfiles/file/2021061115484473499.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b0c4c6f44480b946fa3896a7bbd9f200/51800834685.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a27924d114f---33178288105.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 16792 bytes
font_01_sfnt_off0000fdc4.bin
c3a741360602ea36b4f4ab1b70d02d4fe6a3e2920db1cfd1c90dfb9421eea191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 17364 bytes
font_02_sfnt_off00012b39.bin
84842c76ac68624aecc2a1ad58bb3d6adbb5a483dec017a1e2fd395ef58b136c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 10896 bytes

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