Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f00458e3930c74…

MALICIOUS

PDF

76.0 KB Created: 2021-08-27 18:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1898d326403768bd01386895c62b54d2 SHA-1: ebeb83cc77cbfdc16f22692317774b650e004057 SHA-256: 50f00458e3930c74253dcf312a7a3acea75679f4627155eb92da457ca1ebc186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests a coordinated effort to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/31497980919.pdf
    • https://auto826.com/uploads/files/4176820543.pdf
    • https://www.pharmawell.eu/ckfinder/userfiles/files/37679657497.pdf
    • https://nestuby.com/userfiles/file/fomefoxag.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9e688cdec5aed45f89607fc8cb9aea76/tirofivuwi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0329643d2fb0aa913f6fb4ee72db261b/fezepixaweruxix.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9fd03933e61d792240fd9a523c335337/69776239155.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609041eb5c89f---mikufozulebuzedipoxeni.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/94614666919.pdf
    • http://ahcxdq.com/uploads/file/022145488126.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbc9a42ab3---70865725547.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9pnuh2nm7plcj212ckb0jbndq7/66996599046.pdf
    • http://alexhoffordphotography.com/temp/files/file/11675597841.pdf
    • http://iglozawiercie.pl/zdjecia/file/27337612915.pdf
    • http://sh-songshi.com/admin/upimg/file///77835728563.pdf
    • http://eperon-kochersberg.com/img_db/kujazuxeda.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mqf0rqiu3lh7qitk7rttp84f8i/69936142804.pdf
    • http://turatabor.hu/media/suredajep.pdf
    • http://abovomedia.hu/_user/file/badevopo.pdf
    • http://rts-3.ru/upload/files/fegolikutorabusigosi.pdf
    • http://derma-dts.de/files/file/56118375524.pdf
    • http://franceplus.fr/userfiles/file/59444269395.pdf
    • https://bmat.mn/uploads/ckfinder/files/saxarapemexeruruvujiwa.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3518f51b9618749a67de1e70f3beb152/45668620640.pdf
    • http://attlas.center/userfiles/file/56149392909.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=baby+baptism+clipart
    • 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_off0000c8e6.bin
08f8315752c2735556f577445c8138ea83a0e9e559167c93425334b9b99a98c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 10488 bytes
font_01_sfnt_off0000e097.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 16792 bytes
font_02_sfnt_off0000f8a9.bin
e3e3329090636244525609d35a03a4c6cc065e0353898ddce355ae51eb1ee728
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 15924 bytes