Malicious PDF — malware analysis report

Static analysis result for SHA-256 455b9477b86cc9df…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 12:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff8e3a20689ba794c2534829f527d8e9 SHA-1: aa849b86b81e4ed29e0baa6fd99bf0c44a81e2bc SHA-256: 455b9477b86cc9df6cdb249f61c04c1c0482a7f87b1bbb07dd092fe212f5a5a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan characteristics. Heuristics reveal a link farm structure, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dsmpqebo9ga9gn28hs9pu6050k/siludokawabe.pdf In PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/27342795521.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/38525695967.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pikadabomigagedakipefapol.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/wagojanime.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/88674248516.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/bujuxomurutelejif.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/vemonisegipirimegarasi.pdfIn PDF document text
    • https://kaparatt.com/images/File/mewidi.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/ditonedugubexe.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/puvelan.pdfIn PDF document text
    • https://regenerateacademy.com/file/nosifefa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/51554167010.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b7m1gmrn1q0efh33s2s3dhgl33/83090366335.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/pixojilofavepagezu.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/88978700144.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/39630710389.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa121554d---97658740398.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/87632596592.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2d7760f0b97846b0ed7dc8a4b1555761/nerojusoguwexudubebuxeto.pdfIn PDF document text
    • http://ge-mak.com/files/kelolobafadovudimiledu.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/pitogefodorusezix.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/90340492804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bubble+charms+free+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16580 bytes
SHA-256: 4d68b21b54ac93b842d1ab877e48e9fb23a2a591b328b8f8e545b7ff96e3b54a
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10660 bytes
SHA-256: d7a2a8da05543e71630731fc3078502ae0a8a78007f7b35c73ad178a551aaa6f
font_02_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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