Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca6f8d51e1d8886…

MALICIOUS

PDF

95.1 KB Created: 2021-06-28 12:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e897b828e621fab9610474bdc55427a5 SHA-1: 87270d062469e04f92d0acb09c7827d39efcd3e7 SHA-256: fca6f8d51e1d88864baea25cee9d1bacbeb3314e5edcdf38bac252f8e4cafc35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://droprint.my/home/ququ4923/public_html/userfiles/file/vopotasitetiwo.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/ximaxowuwubo.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d9598140d4d---9453883965.pdf
    • http://parzenica-bialka.pl/userfiles/files/jisabiloravemefij.pdf
    • https://banghenails.com/upload/file/87008054692.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d8e2d2ac---77645651780.pdf
    • http://blackhorsesc.pl/userfiles/file/85027567080.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7cf63a7579eed4d6a3e8e3864f591b5c/puvugo.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/26d46ade7e4975b5ce120e9038a50239/retivuge.pdf
    • http://myphamlulanjina.com/upload/files/fowavodobigafokavapeba.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8e79646a---dulotalozeponinobasagagol.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae86caf618---lupofanesukuregu.pdf
    • http://lookkorea.net/userfiles/file/vofepag.pdf
    • http://greenhousehotel.vn/uploads/image/files/fixananalizulijara.pdf
    • http://claphamtaxi.com/survey/userfiles/files/25336026028.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jo9gduo6dmphh32mquiscm692c/kogevojapefifezewejonopo.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789acc71de4---86409462438.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rs1m3fm0qvmhkl1poremi4ip1g/42851812515.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd2779ce75---55356352326.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7bcisu5vcg70mt73sr3m7lnlj7/wewejolojitas.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3988fdd50a246176e095dc4d07093793/31202900788.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d4c776e4761ae50fadf953b48ae2460e/dabod.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160879afc4e991---54689251878.pdf
    • http://originalcheck.it/public/img_admin/file///dinapelekofigotolag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=purple+weed+that+grows+in+grass
    • 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_off00010f54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
font_01_sfnt_off0001276b.bin
e9e23cb27a5b1b86e5e2c5bf9b9bdecfe5f88733c987b95250d3b0bbcabae14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 10860 bytes
font_02_sfnt_off00014045.bin
72c9882884a5e3d4987a3229add25e028e9f2bc513777ae38683f0d7fb899c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14045 17392 bytes

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