Malicious PDF — malware analysis report

Static analysis result for SHA-256 84110d329a8d740c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-15 22:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3724ec9328236f889fba55cf73f591f5 SHA-1: 2262894029e25b49ad84521f787b0a30dee70835 SHA-256: 84110d329a8d740cf463a5164223bc12a9be5d7bf8bb696dab874f9e2f93870f
176 Risk Score

Malware Insights

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

This PDF document is designed as a phishing lure, presenting itself as an image to trick users into clicking a link. The linked URLs lead to other PDFs hosted on compromised CMS uploads, indicating a chain of malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a dropper or redirector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16135924d496bc---11493788472.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3gl259r2moa9afg2185uebvb3/23022234464.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/kakeruvozemov.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/42252145691.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/10029363a8110a877613dd87e7c6be25/pobajiras.pdfIn PDF document text
    • http://cochemical.com/upload/files/duxafokitejex.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/28774487987.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64530c3b7---pibudumunoxelofadud.pdfIn PDF document text
    • https://fishuntpesca.it/file/53363269536.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/15806786021.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210902125444.pdfIn PDF document text
    • http://huiking.cn/uploads/file/010841351171.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2514dd304a966e9f6335ffd6499bc814/soditanafesu.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wosimiliwefem.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mnrlu2231eka3heeeqsskk3u9s/80594244199.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/seranilaruxa.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nutukolizabamen.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/29369027394.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/lasisimaroku.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/56963693499.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/82409828639.pdfIn PDF document text
    • http://selidbe-beograd.info/files/48817325817.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/83216161070.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/wijapixemodanulisadabodub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+cache+partition+wipePDF 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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 14348 bytes
SHA-256: a44675aab596bdd79a899bf54a82c3f13848695707736dd2a532407a94cede75
font_01_sfnt_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 10504 bytes
SHA-256: d103a03182e92c1fa829f0737fccce74b686cd630d90336073e205476fe63c02

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