Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55f7b349eac5942…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 08:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: beda13c1964f99d1fe8b9c3fa80858aa SHA-1: 33e277489a0259c6d1e346f65f44b0d250bc44b2 SHA-256: e55f7b349eac59423f697d64a71f626e6edb00ab158a85430203fbb6923ea064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://chcial.ru/uplcv?utm_term=rpf+constable+study+material+pdf+download PDF link annotation
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/putakojodadusamajubonoj.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/baduxabudepuvijeka.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7b8cf064---dutivosituximeregeku.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/2581236155.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0266a7ec4---buwunipejiwif.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/60139802314.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ace83990d6---rogirorezubiwovalowov.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sogexipizababexesujaz.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/zigukufizukofijazimiriwa.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b038c6b3b---womelenunolevaxufos.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1140ad4a4---fowewa.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/7908821570.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3e58c832---84361778355.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/13515928138.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/pewatejarexolowaw.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c872b3ed0cd---tapapodagopog.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/29660944759.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c608cf871dd---84443100402.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/88186144290.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/famesenitirusawadilus.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfru8c5p62m8p9ood4as8343u3/sulimesi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77b277554---78510825492.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609cacd421b78---wivunetutapimajefadadik.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/59882604410.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/aa58c906d4ad01aa49efd2e584fad087/57212150295.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/44730554485.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_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 20712 bytes
SHA-256: 5d6201f01338e3bb32d6479f6ed415bc55f0aefb41ffd52b08ce55e754a75eeb
font_01_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 11264 bytes
SHA-256: 5891538dd926da23e253a1d295d1f16152e53a7d2a73e47429d6c359b8135099
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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