Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f4d5cc38762646…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 02:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f45f1d2b82edfab1163ac1519f38e388 SHA-1: 06f7d237c15f465811bbee6af41561547c00aaa2 SHA-256: 52f4d5cc387626469216c586f4ebbc224dbee2e08020e8c25c0ef549212f3bca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=cataloguing+in+publication+data PDF link annotation
    • http://newworldss.com/uploads/file/poxagetuwugixu.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/66635463791.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53f10fba2---51094515056.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2473541aec---2504518147.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/32072213167.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f6da5a6---padatinovixosotonexo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/k410ptc63bla4bnmgbb832uuh2/kugevepu.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/ferok.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/zusuwulomezawo.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fapuvelokuxalojekeko.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/48359bbkpsfmaffddjglv9sd3a/25516024095.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/63408412539.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/funujizilagiwog.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dad136b04bf---27287928742.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34699ef81---suledarilujubixetujiro.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8433ca0092---59243698816.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/79924131758.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/zewaxefovipojajatusutej.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/zamezovirivojeb.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/25et02rat1262ugqnia0agftgh/39598217710.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/42567445598.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/49475f92e1fe00ce9da7684ebb11e247/pofepido.pdfIn PDF document text
    • https://schmitz.cz/res/file/83769494639.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121aa6264103---ditivuligolog.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_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 18508 bytes
SHA-256: bfbcc12eff2aa981576234a871899780f24e08502bb502b37bc53e00dd5da0aa
font_02_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 10560 bytes
SHA-256: 396b79ff7ad5813dbb0cb757546664458e8d433a6452aa1a6483940c371ab3db

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