Malicious PDF — malware analysis report

Static analysis result for SHA-256 86abc46fab965cb5…

MALICIOUS

PDF

79.1 KB Created: 2021-07-23 14:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52e57b588e4bcbdc6c884879d1132fd3 SHA-1: ba8fefc27c738542d89f3a2c0550d183bf66e0bc SHA-256: 86abc46fab965cb5b0d39d0b79ed3b2f661e2c0311e4ca8528630e2c681529aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972994afd9---57024439333.pdf In PDF document text
    • http://stlnsk.ru/uploads/file/11632829976.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/91075454250.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/nonulaluvokeda.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/mudaraxeroxire.pdfIn PDF document text
    • http://rld-carbon.ru/file/zategijokafulupakuzogotix.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/5853398946.pdfIn PDF document text
    • https://luminex.pl/upload/file/dipagixefinipokikurozew.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/saec0gkohsuejfljfnpvhkb3pa/98042763884.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/552068b3633b8c55fda7b23b2e327362/duzif.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609691f0200e2---nozidawekofodonoziro.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/892050d88a79656247c3bddfbe1dc99d/vixitoxagixese.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/19291401789.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/43276960826.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070382e0aa88---20330645300.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kevomubuni.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///balukopikumowijekon.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/wijekisonefusesenilew.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d86634cdfe3c7244bfa1483287fd8e8d/razugojolovarajazijutixa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160712556ed43f---39606513473.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/15794495709.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/digubuxizipod.pdfIn PDF document text
    • http://tianfonmm.com/d/files/34951031089.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/95631857301.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210522214839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lester+sumrall+books+pdf+free+downloadPDF 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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16472 bytes
SHA-256: 0cb2daf317a6740a351f0fbe862584b73f2b8b73cdcf3463201d7309140fe54e
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 10940 bytes
SHA-256: f78179009a9058e4f06aca99a0c49cf7eec6ecac02bd6b4c15a11047e96cc0de