Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5150638a85c4599…

MALICIOUS

PDF

892.0 KB Created: 2021-07-01 22:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e3b2230c12bc9f8bb0403f5bd765a7d SHA-1: 4af158fe95cee5bb861c730fb554d647e6e97ec7 SHA-256: b5150638a85c459972036f4666847080062bb1a85c43404959b1515b262fa0fd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious PDFs. The presence of external URIs and a high number of distinct hosts involved in hosting these files indicates a coordinated effort to distribute malware. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4885

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b76c79c1f---tavukamuvapofes.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7583b90b---88976647894.pdf
    • https://organicfertilizerproduction.com/d/files/nusuwidatakekowarupewip.pdf
    • http://kaies.cn/upfiles/file/71932872616.pdf
    • http://yogo110.com/userfiles/file/87020950793.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f3899e11---latukusegut.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/sukawetuwenuxewuram.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4fbbb004---pizowumipobeb.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/5383720398.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f8c876a7ba06ab4ff5c1984eab3ffe61/mupoxoxevowelekunod.pdf
    • https://syntellect.ru/Repository/file/ponukonopobixunejodifova.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2b477d91169acb37a41b1137a078775c/63345657674.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673ca7b4f---dakimolom.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c36cd67a123---31821860717.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b2ce6b0f---67423574252.pdf
    • http://slsnn.ru/content/files/32427179271.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083eed8dc556---lefewig.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3b09aa174dfeec759eb16f0591f42da3/40459282329.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05771e97ad---rirasavufot.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/dbefc7a026f7afc45455bbf25a3a2df6/tazukukajaxiwade.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076305b4b7c9---fifagojobe.pdf
    • https://eyetracking.pl/userfiles/file/23720445081.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ar+answers+any+book
    • 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_off000d825a.bin
012da0a248aaf483774040e75b45352a17d3552547b51b6278ad6418ec3be89c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD825A 10276 bytes
font_01_sfnt_off000d99b9.bin
bfb4f1153ab25e4325cf9d71b0aaa9ec201b0c6159352649b79a6aeea793b68b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B9 17196 bytes
font_02_sfnt_off000dc6d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D7 16792 bytes