Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c935929a29e2764…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 18:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b22bb12a56de97f3d904f735bce6d50 SHA-1: c6ee7307033a78d155a2f8fea546ebd0e85bf644 SHA-256: 6c935929a29e2764a05602941119b5c0f3c601e58f0ec010d153249c2113da59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=pa+motorcycle+manual+pdf
    • https://beauty-full.ru/uploads/files/66443236740.pdf
    • http://rcp-ranstadt.us/files/baluru.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e443026a4d6---bavabal.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1fc0c8209---wunazupovijelitiwitita.pdf
    • http://acutecardio.ru/sadm_files/mabubaki.pdf
    • http://matstravel.ru/userfiles/file/71395091499.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44d16c4db---23021405131.pdf
    • http://stressmanagement-karriere.de/userfiles/file/fibakiveru.pdf
    • http://firanywiktoria.pl/uploads/editor/file/funawewim.pdf
    • http://studioaba.net/userfiles/files/remipelaw.pdf
    • http://fine-cottage.ru/userfiles/file/vaxexunigi.pdf
    • http://engcaphone.com/_UploadFile/Images/file/pezomulekozagirufubi.pdf
    • http://syntra.pl/userfiles/file/jagirasetazofutunud.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/10694524927.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1i0pvlb2btfd7q5grctqiqqn35/rilime.pdf
    • http://coeb.eu/userfiles/files/15974937337.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/65697367041.pdf
    • http://archi1919.com/smlclub-files/file/pegugebuliburevetabu.pdf
    • http://elpijisystem.com/file/58362337725.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/14f906b23f581a72ce075eca4c736a05/paziwatarobefupogamino.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a22c49c118---76292165864.pdf
    • http://iamsong.vn/uploads/files/11657261016.pdf
    • https://proxus.nl/file/89924731942.pdf
    • http://ketoanantamhcm.com/uploads/files/31196437181.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_off0000db0b.bin
50ca7ea70c0b66a23aa98e4cf70e4be4ece31aba3a694c3e945c6f5dcb21f58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 10736 bytes
font_01_sfnt_off0000f3c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
font_02_sfnt_off00010bd8.bin
527500a4659693ab8063cbc7f7056e4632eae55edb1874bea8911504765a7ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 17460 bytes

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