Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a99d331f1a3b86…

MALICIOUS

PDF

100.0 KB Created: 2021-07-26 01:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b589e99b2ae22405ace9831e5a9589d1 SHA-1: 897ad8492f1e30b507118cc8343b2d2b774447b2 SHA-256: 90a99d331f1a3b868694b72e057740f2cb2b4cd547919fa82393fe7fdf543be4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external URLs, many hosted on potentially compromised sites, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://imi.vc/upload/files/44596653523.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1633463d21bf5f1de7359fd3fc863222/zunaj.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092778fc34c9---parafikagexetabinir.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/burivupufemevuwo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfed409525---vijukoxiretex.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vf5gdkj8bok51arp9i98d9c56o/tivojesafotid.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/44668037432.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac6221213---kuker.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dcf3a5170---varemeletusavejesiwera.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b18e94d73---41801442238.pdfIn PDF document text
    • http://plinoxotar.it/files_pagine/file/pazofokuwopilanodisit.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/sedelipimuzizebad.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4601b4db333ef77bfee24928101fdf22/3071129327.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/44129518309.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/b37fdnqvo0ui6l83csphfats7h/mufowawuzokamizisoluraj.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7ce3f724---64658311976.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/91990cec342cb62c4cc92d38676c8924/pofofenoxalor.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/32999827657.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tajametujivuxuxitidanu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/46799839503.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/miwasajolixulapuxu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7534e522---nobofokofepeponun.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/68088450990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=realidades+2+capitulo+4a+answer+keyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e41c9ef5---palazosix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 18800 bytes
SHA-256: 3c259f6810f89d8abaea4339f6965954a9bea2beb6e5b82812af29f560059d16
font_01_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 11140 bytes
SHA-256: b997b6fa3829f66f2368ea44b010402cee71052176c390f104847d753c8ada56
font_02_sfnt_off000151a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A4 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00016723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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