Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c40573677c7ccc…

MALICIOUS

PDF

86.0 KB Created: 2021-08-12 06:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b229b48ce7a6e73a6c24a86df8ab3407 SHA-1: 89cfef7e7d1940e4a21fda6c7574f4c337478309 SHA-256: 47c40573677c7ccc0b8141253ce626df9dd55b41420be43cd942034ece47f201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to lure users to malicious or deceptive content, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xo-sound.ru/userfiles/file/lumoburijo.pdf In PDF document text
    • http://cisseo.net/userfiles/files/vakimirevofuge.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610130e62937b---59486663445.pdfIn PDF document text
    • https://angkalaris.com/contents//files/valon.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/ponazubozerotugimira.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/sabujejimeded.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/redamofarifudarud.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pefakokixilojusezuxo.pdfIn PDF document text
    • https://designclarf.it/file/27558447608.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/bfe7e7cb559fa6d0c03bf6bbeb7755e7/vawovujidaforalerezoj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cce23466bb01859ad4e913ec15464054/69475837624.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/66709810781.pdfIn PDF document text
    • https://uangraja.com/contents//files/kafowokerixojolizuve.pdfIn PDF document text
    • http://honda-vo.com/upload/file/43826409319.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/lodudugi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e0ae90f25---15783963340.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/94767936580.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/12906671580.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/10339478108.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/murarawikixenaxip.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/fudukuxobilo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/37018e55991fd68cd385ebfbb1e472af/mivisolaxewoxipulogodiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+connect+a+turntable+to+sonos+speakersPDF 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_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16884 bytes
SHA-256: 429b46b57cc0a5656e81ed6a07f885fb12a244f9158288829fbf06c8fa3a50c6
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 10684 bytes
SHA-256: 3b15fab6edef33d6fc7d8a94044298ae3e26e93dd973cd2f91c55f3429b20e2f

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