Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fffe519a87beeb6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 08:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f832e3b88d1d4a38f0964074f655660a SHA-1: bc10e4430967d724e58ef0223532ade3d100da93 SHA-256: 5fffe519a87beeb6e8a5cbb72a84877df1add9376c605f98813c593270c220eb
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or leverage SEO for malicious purposes. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ultralloy.net/upload/files/34921755906.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/qa8lu3ru6248hlj9udhcjjdm9f/63654113731.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/84319814830.pdfIn PDF document text
    • https://tavio.ru/files/file/govapesosuwadetugazud.pdfIn PDF document text
    • http://samtle.net/ckupload/files/lixovojisivim.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/44441028694.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d53903063---sefosubukatofedusipug.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/22290502520.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/baduropam.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1caf7916a98801bf3f62d817e569085/medosejedaxugu.pdfIn PDF document text
    • http://p-energo.ru/content/file/94404730836.pdfIn PDF document text
    • http://nova-auto.com/upload/46940208562.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7227052c1cd8e0e74ef475d5479203e6/katez.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/xogudawunivibikavobulo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0a28b70e99d3f92ba4b77fc9c68feae6/67390046252.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hqqfvu9gvt8b652qhc1p9glea7/vovurureregeberinotupobof.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/74404677739.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e889989f73---24351010310.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/nufube.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0f907172047f5d291895f7a6d3a5d83d/modaburafugam.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dk0j10al3p6qtqke3dbglbqdhs/33633297332.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/bugexilawuroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spiritual+scientist+pdfPDF 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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10668 bytes
SHA-256: f856847ab141cdf20a798095ed4975957efa31df7ed94fc9072240e417fdb93e
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 17356 bytes
SHA-256: 04bb8dc33f7dae2780482c34c830a5f1d2d66c1773ee600eeef8972c1c0edc25

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