Malicious PDF — malware analysis report

Static analysis result for SHA-256 904528f18326654d…

MALICIOUS

PDF

74.9 KB Created: 2021-06-26 00:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fbcccc205ae4d61f07efed01ad1bdb1 SHA-1: e02b5aaf252da19b6d784f89d1c85b9d29d2422e SHA-256: 904528f18326654d8e153fd9cbd607293e764e860628a00c3fbffa487d042d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97ff5b34e---76201294786.pdf
    • http://portalcom-b2b.es/img/user///file/_0622166001621554301.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/75c33be49612ee67ae5ad6614e3fc6c5/81703377353.pdf
    • https://t2sc.me/userfiles/sipidebisolimofi.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ses69mt7ise1lklvjv00nid2br/tamapijewesopo.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609974e29fd8d---nuzuxujur.pdf
    • https://stillwaiting.org/userfiles/file/suwezogefugaxexagevot.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9p0m4696vc4dlic8h297va7t7k/redufutivapamima.pdf
    • https://aspirans.com/files/file/palukamiko.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e3971f24---kavareweronivusosudova.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b876ba91878---vowewububoragila.pdf
    • https://bruceautoservice.com/files/file/refolezun.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160941f759578d---xabadipotuxariwusixe.pdf
    • https://amitadevnani.com/userfiles/file/minif.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadae47380---numonosegonaxuw.pdf
    • http://tunesistudio.eu/userfiles/files/nowusinegowad.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d52c285075f79596a766d1c7fa98c749/zipizuluzo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2j2qim8m1k7h3c8hp5d4i87phj/27366699996.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5318b74d0c---41138385728.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea2925b1c---20847156652.pdf
    • http://tourister.kr/userfiles/file/8802434746.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rv1d85l5k8a7rg2p2od4l1u31f/17839458919.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/db72453afc59e099f418330d78f7177e/gawexokuwizebunufuk.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b906f970---42651813046.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c933a0a2---58937837278.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chemistry+reference+table+workbook
    • 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_off0000c305.bin
02e9ad7fd3c6eeefb0ac57fa047ec4940d0960869fb7fe0a486ffc5f2b8a6919		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC305 16016 bytes
font_01_sfnt_off0000ec5a.bin
fe0ae3a7ccf432beae8a8d186456af696571ef9e96288b33e87623cc2f323f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 11064 bytes
font_02_sfnt_off0001060f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 16792 bytes

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