Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c851eddc92d22b2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-08 12:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f814372a39da01ebdbf98ecfeab9114 SHA-1: 3467ea8a99a706a8a1b7f6e03350355baa056305 SHA-256: 3c851eddc92d22b2cbbcf50cd7a38398dd0af8a5567697b1fae36fdb7f58cd6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=face+eating+bacteria
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4903fe0678fd542084954ca9973a5a4d/38546674246.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bac5598e658---28022044468.pdf
    • https://gikguamerica.com/userfiles/file/ruteziwajuranubo.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bbabd3b8f---darumupuvox.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3df6deb2---zoposusabulokekotevi.pdf
    • http://ekhoron21.mn/uploads/files/17948312681.pdf
    • http://budoprojekt.eu/obrazy/file/simulasubota.pdf
    • http://vinacafe-dalat.com/Images_upload/files/21585461906.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e734f09cd4217d498faf1d8148192a6d/zolimevaji.pdf
    • http://zjpjxt.cn/upload/uploadfile/file/sevuzinigomaxeno.pdf
    • http://www.aluvascientific.com/UserFiles/file/rimaz.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfda2e7230---63438265270.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/20632863583.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1566c2b7---59700917815.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aed3e118c66c8a60567483a9e3c74a20/temevananojigujojisaxami.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jg612d0dchottoai6q3p70e4t6/bexulomasesefazimuzex.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d981b82a5a---8518372631.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23d20a23f---68925186121.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/o87qf538fvjb2opm52njp2c4a0/kotokef.pdf
    • http://ikkosushi.com/uploads/files/rebabesuwovopenob.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ff237aba---jajufuv.pdf
    • https://psfund.org/public/uploads/files/cms_files/20902829517.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/40d475b6a8b6283b40907a2b7d79c6ee/giwejoza.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_off0000f25a.bin
70808718758aef513bf3afad4c5faee1c07bff69bdb208b555df9237b2e560a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 17172 bytes
font_01_sfnt_off00011f50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
font_02_sfnt_off00013767.bin
f228390e6baf383d47c44117e2535f47cb7a51ff69b07a1cf9c4f9d8b80384fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 10188 bytes

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