Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2557a1fbfea3a2…

MALICIOUS

PDF

95.7 KB Created: 2021-07-24 13:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea182f8935d2c013493017e64d8452f3 SHA-1: aa003492e1dc5583d297c8219df8488c6ca5da8c SHA-256: cf2557a1fbfea3a26c6bbeb227fbe42fc24a1e81c193b9af6fed6cc76f2cf555
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's content is designed to trick the user into installing a fake browser extension or update. While no scripts were extracted, the presence of numerous links to potentially compromised WordPress sites and disposable hosting points to a link farm used for distributing malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d3c2ff39---sidimomosepakurizo.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091372a2a60a---20661693046.pdf
    • http://erfaspot.com/resimler/files/43709567133.pdf
    • http://abnicum.com/files/file/79638123540.pdf
    • https://stiff.pl/ckfinder/userfiles/files/kuvanireve.pdf
    • https://sy-tech.eu/file/wejuvupizikagijikuzelo.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/46d8239ace463169299b8af64d117a65/nuroludoweduto.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cb68921c2fe0ef7cfde9d1dec6ce8dee/44448286129.pdf
    • http://indecomavo.pl/inc/14065172284.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2535c00cd17747639c22381912732d47/29067765644.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e71ab0b85---19631347920.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749237b4217---bobilosurabagojijalaxa.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d792fb38bfd---73069573685.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/93ba061b34ff50b48211592e93815208/jexamokakiwuzuvopodor.pdf
    • https://zlato-eu.sk/upload/files/9607186631.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889a687a6f5---69569914918.pdf
    • http://aygroupmuh.com/image/files/nofafurebuguvixuvuseku.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/xitimus.pdf
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/94273050891.pdf
    • http://stroisvias.ru/userfiles/file/nogasoguwamekudokokiwe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mx+player+pro+mod+apk+download+for+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee44.bin
6ee91104163662252c0ff2d3e1b3c41421b5b2c2e79c5040d5ba69739f7caed0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10780 bytes
font_01_sfnt_off0001071d.bin
429a455df7408c6d4f5d1b181582924dca7f2f7eb6ee24faaa9ae4660396fa2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 29636 bytes
font_02_sfnt_off0001425e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1425E 16792 bytes
font_03_sfnt_off00015a6f.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6F 16092 bytes