Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f44dc7fae09e7f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 20:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 895e910ddf9bdf89a364e7dd8c8fa88d SHA-1: fe139ae3887680e0f5113e33bdd9c54bce101717 SHA-256: 67f44dc7fae09e7fb16332546e249dc0cbce21e18fa597ae2e01b20921363a6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=pokemon+randomizer+3ds+download
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f790efed08b7db14333f558870b71de7/movowenowiwag.pdf
    • https://bosgo.mn/uploads/files/23735276140.pdf
    • http://cleangroupbd.com/ck/upload/files/lejunogavafavivazode.pdf
    • http://elturo.ru/img/upload/files/venigat.pdf
    • https://playindiano1.in/ckfinder/userfiles/files/vixigagepepegaje.pdf
    • https://aspirecambodia-edu.org/userfiles/file/20883241404.pdf
    • https://tskrea.com/userfiles/file/fifegejifavamujizijuv.pdf
    • http://80tner.friend-match.com/upload/files/bububibimodoxupotuj.pdf
    • https://girisimhaber.com/uploads/file/105991768.pdf
    • http://havefuntogether.com/image/upload/File/wuribufabozozijexureze.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/batofosufawugadazusanu.pdf
    • https://llbyggodesign.se/UserFiles/files/49308183388.pdf
    • http://ranch.pl/files/file/37732524296.pdf
    • http://zjgjqmr.com/v15/Upload/file/2021917345354793.pdf
    • https://calendarsunrooms.com/userfiles/files/sudubofoda.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89d5ca84a---60014284657.pdf
    • https://ofcourselc.com/admin/uploadsfile/51352556878.pdf
    • http://budropol.de/Upload/file/tibubunojo.pdf
    • http://futuralagoparking.eu/userfiles/files/wedejifuson.pdf
    • http://palaciodelosnavas.com/userfiles/file/33629768293.pdf
    • https://lalicorne-hotel.com/userfiles/file/ditubov.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tpkkjjvhvvuiq4n5rbmsack6fh/jebubodokuzozujesoz.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_off0000c99c.bin
52d44b571b842e9dff7cb62941918f67bb3dc71d5f7729a9ddd0f80e69f1c873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 10720 bytes
font_01_sfnt_off0000e24c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 16792 bytes
font_02_sfnt_off0000fa5e.bin
adfd62ccd32f02d403086a1dd91e74e495786ea3b5e18569ad8801ab262da935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 18004 bytes

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