Malicious PDF — malware analysis report

Static analysis result for SHA-256 defbe05de919a04a…

MALICIOUS

PDF

94.4 KB Created: 2021-09-04 23:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba8cc3b50098b6402c4cf836cca9eb96 SHA-1: 28e55657127daf5473fb7c5af82c146e7eb449bc SHA-256: defbe05de919a04a2507db5ef6b194ae637f0772e365f42b330012a416f45a46
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious or phishing content, leveraging a large number of links across different domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://b-solutions.net/userfiles/file/sowuratugagoduvi.pdf In PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/genukerozanodideliporaxi.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210829051111_dikgv3.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/tudabupojopi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/44e330a9e189576d2958f3525b76c108/12121258412.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/81395396247.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160834019c28a7---7226812525.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c82183858---gusikulefabuvopejowukeso.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/84323425441.pdfIn PDF document text
    • http://www.77ice.com/upload/files/77472562767.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/10208122098.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jinanobudirixakid.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/6416415469.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/nijugolimufux.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c30bb03f5---73758915027.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160baa1e80abca---54312358350.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/92677993143.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26b23489b---59892022678.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/50133390890.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24caac0727---zoxozasivedosinufo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/47de2ca7b6ed85fbb7932565020c60f1/4747837341.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/26777207848.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/29124193365.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vimududu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=trimble+business+center+hce+manualPDF 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_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 18112 bytes
SHA-256: 44317b8153dac21dc03aa6af8e03ad2910f1cf17c439cb96846f6509e95b32f1
font_01_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 10580 bytes
SHA-256: d96830539fb596b4c033de3705c2bbff217423bd6cebfc21c38f16ed4c689ac8
font_02_sfnt_off000153c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1