Malicious PDF — malware analysis report

Static analysis result for SHA-256 2285d6a159881d28…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 11:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eece2a6f37beae9e453515e8b805319e SHA-1: 0f49edfb6de3a4a270cade91504fc0678c239c3a SHA-256: 2285d6a159881d280b4fbbc8388c2c3bdf2b7ca63feeb7f0e5f15fa5a92e0677
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. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://blogsma.com/files/76510574456.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/tuzededopevesavidirudu.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/20150051825.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7cdcf93f362decb1162fc11835157abe/lukijusolixigudaruw.pdf
    • http://citadelcaralarms.com/userfiles/file/rojewijerof.pdf
    • https://curewelldiabetes.com/userfiles/file/jamazipilakixigike.pdf
    • http://angelescare.com/userfiles/file/90616156269.pdf
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160856b008e868---84364383653.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96637f869---28525749807.pdf
    • http://pizzeriadevita.it/userfiles/files/kanijoxixejubiguji.pdf
    • http://absolutelyneon.com/userfiles/file/bunabo.pdf
    • http://alpha-cp.com/userfiles/file/vesofozamos.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lk1e7rl35vuu5sakkf3jhjku53/36890542208.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746fbe5c496---nitajupizunifetevodorivij.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074495dd4f8b---bubad.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/58856790358.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/ramowepivukapapanep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=future+tense+worksheets+for+grade+3+with+answers
    • 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_off0000cbee.bin
739c27a661757a6c5ce052e0a95298217a1d3fd383a196bd59c0c73543bfd02e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 18660 bytes
font_01_sfnt_off0000fbf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 16792 bytes
font_02_sfnt_off0001140c.bin
22a8536b492007a75134a2293cf4e1a5f34dcb1aa0ae67df038d21a004904518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 11012 bytes

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