Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de93f8babe0398b…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 15:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b63787cbaeac0b017d009bff1932e743 SHA-1: 8487b4bf740eed41cadd5f8b2e491676723f43db SHA-256: 0de93f8babe0398b59b3dac5903c1702341ed28a5025d2ac9f849874069f69bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ob26dcvmgl1nhb7nekjdsubgm7/ninites.pdf In PDF document text
    • https://reparation-mobile.net/userfiles/file/pataluzanusubivarululili.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ff74983---81717954963.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d59bdc3b---lanob.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/780600c223a99a07f083ed40801ca1a5/37673259864.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/zutijawubejoderekene.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6lrckd3v8psfsgc8vcg748t4jp/gipinamufepiwazavo.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/jezifelisirularaja.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/gedifefumenev.pdfIn PDF document text
    • http://cl-pub.com/files/files/48604982992.pdfIn PDF document text
    • http://wenxuezj.com/images/File/varelituruzipupalekibiba.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9aae1b70---51776254062.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ludejekugomuterusofoketov.pdfIn PDF document text
    • http://sam-global.info/files/file/80957298871.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/85912296904.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/2768604317.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d8316d8479f---nujusokolidedufovuk.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/10518423203.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/12966157569.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a4124711b---83068606050.pdfIn PDF document text
    • http://888chji.com/userfiles/files/17421968984.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/91874757065.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160f1feb08d457---xawozon.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/f7b62c21ff58877e1d2b957045717bf7/64166347346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=turtle+day+2020PDF 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_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 17376 bytes
SHA-256: 6f32edcb2b7ba71230833fbf2a667a4103167ac5568985a6b71799f2390577c5
font_01_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 10176 bytes
SHA-256: cf7b32f0384698302f073eed9c137ec9880bae474edd7bc97df2673f7c78e0ea
font_02_sfnt_off0001460d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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