Malicious PDF — malware analysis report

Static analysis result for SHA-256 5101a862ec3f8d4c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-20 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f522bd079de552844652a5f21444f3c3 SHA-1: 068420d2a1bd8116f09579cefd113afe7aa7c4d6 SHA-256: 5101a862ec3f8d4c5cb37567ab1275657033f81ec91dcc846e88fd6202187c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=friends+watch+online+season+1+with+english+subtitles PDF link annotation
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f85dcb8581ee0a632bed7db6b022d368/99235648542.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/kazotajuloluzajirowebiben.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/22405795696.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/31690953523.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/kexuvomuguxosob.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/difugegatugebomaf.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/404ff5c5f48cebd15e2246916657d7dc/mupivafufekivibida.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/22999288749.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/77984623339.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/wabagiresakivesi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/19653859684.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/044723a0dfb5527849bc337bddfe6719/fewofosis.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/famufenofixikub.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xejixewixidusi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133d09016775---36707516694.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/97394311740.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/15308470486.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98337368133.pdfIn PDF document text
    • http://imaginove.eu/data/Files/21199755505.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/navukoxawegikapiz.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/69421125805.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/mununigelogiviv.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/31785701285.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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 19180 bytes
SHA-256: 9d568ff72f38e71841f6ecc5a43d73ce7bfdaa83f341bf95e136ab29a44190fc
font_01_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 11004 bytes
SHA-256: 9a4f264062e5a1a6eb18c1027c3490b51fe63321464587b960727c0f0dc9983e
font_02_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1