Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30b3c3a6414f96a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-15 21:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dab4d20246dd4687096004a6153e36e5 SHA-1: afdac31d999d6d450c95b1b299b3a6e25ad6a49e SHA-256: a30b3c3a6414f96a7ce5d3e5fba804555ae0e279ee66e9d46250abbd80f5f2a2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/35ff6ac1d0ac0001e4e465c6355fdcf2/jodorutuvipuwoz.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a11916d1611---pakivonatejovokazebiroleg.pdf
    • https://hrmconsulting.biz/upload/files/94792543980.pdf
    • http://indagosrl.it/userfiles/files/puwimot.pdf
    • https://htchninc.com/d/files/55598602425.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210617_10B8EA0828BCAEE2.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2300e4baa68139d031f6868426208bac/vubineresusasililesus.pdf
    • http://tasteofruraleurope.eu/upload/File/67442853525.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/21470fde867c2395718b5f6d9c574a03/pepotavewamikowalofun.pdf
    • http://altinay-law.com/images/file/65542761668.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/11271250343.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c2077353ac8---76765074742.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7183bc081---80961124267.pdf
    • http://lacasedescaraibes.fr/file/fuzikukawezuwuledu.pdf
    • http://adance0112.com/upfile/editor/file/nenaniken.pdf
    • https://gea99.com/ckfinder/userfiles/files/romenowodutamotorilewab.pdf
    • http://olterus.org/contents//files/96332000062.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/98hqshd0ile10pl2hc77vuiiqf/duwepedipopolidun.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33a6268d3---wewijumowusajisaxap.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b4bcfdb6d1b98fa853a15fbac4877df3/73355192837.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/4306147432.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/539a4f3db007e75b58ed9689204b23a7/bigajunegazuzefujazu.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/witotemanavawisomusuno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nvs+admission+6th+class
    • 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_off0000e927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16792 bytes
font_01_sfnt_off0001013e.bin
e3a34461dfd19d27ba2155bd3dc8c1cbf4ba640b155d8406227a898d7505527f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10616 bytes
font_02_sfnt_off0001194e.bin
4b78c90fd774c9b35de1756e80d7afa3ba6736a54ee25830f2489fb349fd081b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 18068 bytes