Malicious PDF — malware analysis report

Static analysis result for SHA-256 059162ffd8f1e4eb…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 10:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfab5d6f1e59e3c8064be9a30a294584 SHA-1: 5842b912b5108f6347672bb656bcf733cdf04d95 SHA-256: 059162ffd8f1e4eb7e5cc0669bd1d2f9ae988a2d8b46fc748da1b6c23a3f40bb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://bluecars.pl/userfiles/file/81577296657.pdf
    • http://hondasushi.com/uploads/files/42203382702.pdf
    • http://cuacongtudongbinhduong.com/upload/files/91398329512.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7685e2b7172778253b3b0f53fac85d61/98637379640.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e17c353---jupomekebemojux.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f218ccc4c---wisonipumafususaniz.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xoxetavin.pdf
    • https://vestol.bg/files/file/42714935885.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cac2ef95a---takelujawavafa.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43529162c6---nalegamuj.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/kizaxufivuzizenikij.pdf
    • http://fitviewer.de/files/file/xuvasadadomug.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5a0d5f91fbfb7cb88a514e8d604d631d/11138391771.pdf
    • https://ehlibeytalimleri.com/resimler/files/piwifejizaledesikud.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6def612b06915c2b730595c8194f8b01/57417550645.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae0fd77e0---kadizanuduxeki.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/o1q1mjtcdj1f9p1fk8r8msni37/14342444693.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeeffa1a98---86972156272.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df221be7c---49529086641.pdf
    • http://stressmanagement-karriere.de/userfiles/file/jepumukubu.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29f721f12---45675505047.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f85e2f2250cc1daf7719ea684aa4261f/jewevupirol.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/voradajajiv.pdf
    • http://ats-dz.com/userfiles/file/bekiz.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807856a2e9c---lezale.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=highest+paid+reporter
    • 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_off00010579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 16792 bytes
font_01_sfnt_off00011d90.bin
dd172823a8a576e7314cc81ba4dbb9f1f45f72a59b4247336c3f3d9ab6d122b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 10512 bytes
font_02_sfnt_off00013560.bin
342fd60f0d49c933bd2090d40a261ad7489cfa460d52a91f56c1807e38e1648d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 16452 bytes