Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa6f360ca2b4f73…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 05:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c54607137045a24bc41dce52928c1ea8 SHA-1: 6492c62ffac3ffcd2ee8ce06a2569d23527ab8b8 SHA-256: bfa6f360ca2b4f73a14ea6eef9f851b9699488b1e219ff454ac174a88fc7f608
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this file is designed to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://designpavelzapletal.cz/files/file/58205330682.pdf In PDF document text
    • http://akinmedikal.com/uploads/file/72629119947.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/liwafi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/871832b6ad8901318b2ef5b9c2356819/14022176313.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeb444f105---67842723926.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/13525421688.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7072c23b7---fetolariwuronowa.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/43638236914.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/11642352788.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/28344923998.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/buvekutesizuxuso.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/40108459798.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24462289384.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922b3505cbe---wuwowemozigodapiposipoba.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g0oebcpejcnb9g9l73mstotc61/2729491419.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sifibidixomawiw.pdfIn PDF document text
    • http://4bx.pl/public/file/janedipira.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/99437361413.pdfIn PDF document text
    • https://kopari.hu/files/file/vajekejutudunozuwajuko.pdfIn PDF document text
    • https://dineflon.com//files/xirumomazo.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fufarujusafoxejozalejume.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/kuvolirutiberoj.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/novobemud.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe61da3140---7874761817.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/15053056963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adobe+reader+full+screen+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 10644 bytes
SHA-256: d3473b9f8d8c71769f2a56ad13c8d53c53ec7b4914a4ffea88cd7655d3f5e3ae
font_01_sfnt_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 21252 bytes
SHA-256: a0baae67f0b586c28a6492e94b93d3d2233413cbf82f834884dfcaab2cba9241
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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