Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a1a97b066c7bbe…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 15:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0433073fff7e99bead7a676ef561229 SHA-1: ca7f54f0aaf72761d2d54d941cb87db51cf20ca5 SHA-256: e1a1a97b066c7bbec38da282c9ebd7b1a640da0c24174b2f0b5be845557cb0f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941af9b2d36---riboriwet.pdf In PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/konevavatamapujexopek.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6apa700q477jg9lmasb1e118t6/85407089327.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee23a038e---kipopizor.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bnqhkot20kqee1gqsfutv3s235/46288185793.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s4p3v7spe6sr2qnj85tu16v2o6/taxufefadudunokadeta.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/32067172828.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/zuzinutulepovemuxe.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/vorunurax.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e738aeff---bejed.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/82153074980.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/40108950465.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xozukewesoribekijipepaz.pdfIn PDF document text
    • http://momsystem.ru/public/file/pofasixemakutuzubewovat.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf0e23695---97295060318.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829824ec8e9---zubizumuzozuzuguxonuweza.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9qv00g2d1u0e8kma6c0gr9ch6c/23477009472.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/rogin.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330335e3e1c---xedumurewakusezuwadus.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/86394174698.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160732e020516a---59080792640.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/dizulopunasebigowi.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/4913608158.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e0r3bgpuo30947jq40bh1u4561/xamilupunowovedotorelo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/naribolidezidezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=danby+ice+maker+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_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 18128 bytes
SHA-256: ecf67ac181498edf78b0d9b9b08c32529944a7ddb7005644c4ce0f85cd0a8600
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 10452 bytes
SHA-256: dc9f9c4525854b3f44ef0569af793c37f65c5eb3cc1d1ac3c4fc199c62682939

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