Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27c8657ebf76c40…

MALICIOUS

PDF

75.0 KB Created: 2021-06-26 10:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 731ed83ca041ce37c82bcce603392fed SHA-1: 64cc5db82a754ee0c5dced62f03235d4e36e1906 SHA-256: e27c8657ebf76c40f3d73d98d012bd4d10bd700a0e30787e5c2a8387285b3b72
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, likely intended to trick users into downloading malicious files. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071749e42fc2---54500908357.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebff830f2---15586869016.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609806e2ed705---79232157765.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hp6tdf3nq8nolp35j7o7boia85/pirur.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03a39a6682---kolikaganutuwaf.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e79c659c1---55219426384.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075773ecd52a---92459991081.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b772e8eb74---daruzamima.pdf
    • https://abugfreemind.com/userfiles/file/xapewilebebik.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6mc9ebel6inc9l96uqk7ca7lp4/jenofila.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f93877dec6da006b810893334d624ba5/nedajup.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/77e383addb83adbc0f511debb78a852b/torigebu.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/glkpac6g3g11k180g0qp0v5gt3/11361855013.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9cd4d495---69229158340.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76347895307.pdf
    • https://nocenzura.space/web/img/podborky/files/84604070812.pdf
    • http://wardwrightself.com/clients/863644/File/jelibamidogarazike.pdf
    • http://dok-vo.ru/userfiles/file/roguwesuduwazalapuku.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7c3f1afe---68752866840.pdf
    • https://kocarbon.vn/luutru/files/zodulu.pdf
    • https://bda.ch/ckfinder/userfiles/files/dulonaxejex.pdf
    • https://kuzeyilac.com/resimler/files/turutelubevugabufu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4e3df1da---xusudenopozoxadilosu.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/37359165373.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=headway+elementary+download
    • 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_off0000c42c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 16792 bytes
font_01_sfnt_off0000dc3e.bin
40c88184f454e9e6949498f457d9b28ebd6713d337850d77969dde87acc18100
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 16788 bytes
font_02_sfnt_off00010768.bin
cb1bfe8bbbbdee87dcf27b0daaa02d2d27ecd0e58ecc35dd93acea1114c8f251
pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 10340 bytes