Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61c5d5b92a3df9e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 04:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f8833bea48474a45bebd57d4859366a SHA-1: be8035c3517073e5c88dc90f96df540dcab914ba SHA-256: c61c5d5b92a3df9e2f7897c6eb9fcb1e60d8adbc99ed9180bef386e66562e6e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to phishing or malicious websites, likely as part of a spearphishing campaign. No scripts were extracted, but the PDF's nature implies it's a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=an+essay+on+fiscal+federalism+pdf PDF link annotation
    • http://cuspsurgeons.com/userfiles/file/gakekolaxifudu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/8769547313.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/31721946957.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/45860611943.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/453033a409910c02e16db885fc78566f/fuvege.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/takususefipasuwaziripen.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/072113434239.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/towuxaxizotesaw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/526bda2258ef8fff1b7d24dd6fe2c5ad/39401547431.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nk23emovj4mh6u862rsjpdvjg3/1313666785.pdfIn PDF document text
    • http://abpaluso.com/upload/file/53869454647.pdfIn PDF document text
    • https://purefeeling8.com/data/file/59531398677.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/zazigutowalelo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e93f486---11764629276.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/82279386363.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/62qjfogajtdf7ut9lvqs7ava40/17222122627.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/22d87cf660f4c121eda02e9eef9b08ce/depalenu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d74ee8800---2857648754.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/6596135538.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/fezapebujubikurewu.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gozudepuvanugokolapesezo.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/lexunur.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5f8ca831---30788842909.pdfIn PDF document text
    • 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_off0000ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 16316 bytes
SHA-256: 6bb8823593eadc89d87b7d7292e3daabef5652d3671a3e5c761bfd894eeba27c
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 10776 bytes
SHA-256: c109f6d9873acb3c61850364c164fb3be79ec965c0369dc9fdc9a336cadcd720

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