Malicious PDF — malware analysis report

Static analysis result for SHA-256 626a098ec6ab0ed7…

MALICIOUS

PDF

82.7 KB Created: 2021-10-07 17:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5d22a0fc26101c99281868227e321ea SHA-1: 820eec326effc5ed3a854bcdae1629729b76cc99 SHA-256: 626a098ec6ab0ed7a98d1aa9ad2d536d0bec8c077d4db7e9da59b8fcd37aeea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and numerous external links align with techniques used for initial access via spearphishing attachments and directing users to malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pilot-nav.socksnbows.com/ckfinder/userfiles/files/xubur.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149edf752de0---nevugewidexibedun.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/5327011844.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/dokeladutugaxa.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4badbd6810605c463fd0973104aa9a/lavupivebibulisumu.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/sadusumarudijisixaraka.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/64340344251.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/59638997164.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/metexilefakajorejevog.pdfIn PDF document text
    • http://poiskvod.ru/images/file/79359189776.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1fde304fd---50234951189.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090416100752.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/1137640258.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/68600106222.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/6760973552.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/41713241319.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/43149005434.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/22684278205.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/12495487664.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/lotaxupejezomawejuzujiki.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lolinuw.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/16218499715.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/soditapitikukol.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/60962483437.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/38099319380.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/10754722741.pdfIn PDF document text
    • https://beylikduzutabelaci.com/userfiles/file/jupomemogalavewo.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/fopufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+simple+life+kyle+richardsPDF 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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10732 bytes
SHA-256: a0a53f7cee9d4ec1b15cbe52eb58c814820e6eca4af361b18ddc21124b813232
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 19752 bytes
SHA-256: 83a88a6ea9e1c0d0da3eae0393e3624a0466ed9e9cf0164def382038fcdfccb9
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1