Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d06ca8f5661775e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 01:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef933c86beb610fdbd12bd7c8521cc7f SHA-1: 55e23c7d255ca3bd412a6d6b3e14ec17a313ec1a SHA-256: 0d06ca8f5661775ee157c166aabc4c4e56f2bb9fa9bc290f0f071739ac243d18
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous links pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm rules and embedded URLs suggests an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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 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://interroadholland.nl/userfiles/file/nabofivigi.pdf In PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/53537258501.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/54734370105.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/parigetewuxuti.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/bipoxapowizovabunoxo.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/26064268579.pdfIn PDF document text
    • http://tfforming.ru/d/files/napukolapovoguxowarofuxo.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/zagazojozuzi.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fudiwisejofugamejigev.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vulasitidukonoguj.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/vatonaguze.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/nulagazivomipar.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec4364369---97586906062.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tofofigominoduwozo.pdfIn PDF document text
    • http://zaiger.ru/img/file/vokibawipan.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1123054369.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/jekorat.pdfIn PDF document text
    • https://maturana.cl/upload/file/minaligupiremuvupijezep.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/bewomufurisa.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/27402157259.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161385c40140cb---mikos.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134268630758---kosamudedizoriwirolimure.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/72501188691.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/vefixa.pdfIn PDF document text
    • http://adveotec.com/img/file/jojal.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jojaxevatew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=euro+truck+game+apkPDF 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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 10484 bytes
SHA-256: b20d8b5c2808f21dcc8b62c7234a07c9df2026347b059de1753acab5afe77177
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 18912 bytes
SHA-256: 8a1d9ff046babcc9d446c4e734ae9918cfddaa5e284db4d206540004b6e0edca