Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a67a72c1f8bcc7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 21:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba65fca008b947c925d00b9dd36cf78c SHA-1: 94d8b881d6a47c38da8a2ba0045fd0f9c4de0d6c SHA-256: b9a67a72c1f8bcc71aa2e27d9723739b6e0af5dcb1491ab224a031ed78d9ab66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://paillasse.hu/userfiles/file/namoxavejagageko.pdf In PDF document text
    • http://schokozentrale.de/idata/78782804156.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/bexukoziwiz.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/xuzomobizomejiwopugukenad.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/23418912270.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/pamekamugodikoxore.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/53693040162.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/23940055675.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/fa36bee7b85745e15bdf457a93facc1e/30688903174.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/29132246283.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/bejabunipomarire.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0255ce047---29170637295.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748951206d9---42478366797.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/fixiv.pdfIn PDF document text
    • http://freeski.hu/freeski/file/5857455222.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfd137080---voweguzebaxasukaxagox.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/telunuxep.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9ffde0c4a56626a8e204ef14016d7056/58289869056.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/jaloxora.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/xenuzevunukobukub.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/gopajanumonimumabowi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9178733799cb14182a2ab31d5c1b68b3/tixekaguzax.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098c311f2c12---36824060612.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/979fad71e5038ae822c4707086900fc9/61664184585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=merge+pdf+files+foxitPDF 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_off0000c71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10500 bytes
SHA-256: 98aa40f7c73100cc0659e97d01d84548244ba863877fc52fa15645c9b3f587d1
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 17068 bytes
SHA-256: 70c4ad1a2d5d53841ee208de739399a93658bf18592c640c7859b176529028b1

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