Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f30d94338da921…

MALICIOUS

PDF

92.8 KB Created: 2021-09-05 13:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: be7ad3dd4bf0158d39c91f6a1b1242d8 SHA-1: cced041e8b45462b28b61fd73d7549c2651fbd52 SHA-256: 83f30d94338da9211017adcc3267ea6139eb949016b441fc087fe5bc6203ba7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=2016+ford+mustang+ecoboost+manual+transmission PDF link annotation
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8df17342dd324c418349dfd5b65d182f/42696812096.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/baxekikopumejipagiwuzir.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/28491556571.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/44358306701.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/86023770391.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/5122853657.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/woxamukome.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073833265aa9---veguzek.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504b7bdf02---68952582539.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/pipusumu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5afdc6d49---51278889758.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/20893254258.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/duwomatupegupo.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/limafamabozidikuledadokek.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/30897100914.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5560b389bb---nebiz.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vokumomivaxofoxevu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c5kbu6hff0h204s8j5d60gnjug/70876644643.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/98f33c46ac95ab8cb5d7cd0ae1796b27/lubimalipuwog.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7558768123.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/v943rkd545mo1ai5meairlj5p3/29791533264.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/59416038097.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/17918819411.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/xagugewak.pdfIn PDF document text
    • 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_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 18076 bytes
SHA-256: 7ac590942459b05e822d804bbfa8dbf6512566253a59100762a21b5d681ad993
font_01_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 11424 bytes
SHA-256: 7d341fdea97b41861866ad66c302f834508806dd6207b11a97cbdd4438c66cf3
font_02_sfnt_off00014d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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