Malicious PDF — malware analysis report

Static analysis result for SHA-256 8619b70dea5711d7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 06:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 810c677d0bf5ab423d58af4bb5907794 SHA-1: de2bf3d2de8db76ce2ae5e2498b0b90ec3a84881 SHA-256: 8619b70dea5711d738514254e31462d899079b584ea54866691e6b6e52045aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8d80a236b5d7294760d2c3356002cd97/jigizubijofof.pdf In PDF document text
    • http://hongdacable.com/d/files/68184980448.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/worarunag.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/21172665102.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/muvewame.pdfIn PDF document text
    • http://stl-hk.net/userfiles/lakelegazefegitaf.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/22050648763.pdfIn PDF document text
    • https://asiabiru.com/contents//files/90256847743.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fff61d4fb60---kijanasujela.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e0069a46b26a5998fd59a7b1230123e1/vemimekusakujakupo.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/tinuwukit.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sikezuzogozi.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/vabisuxuwosipotexew.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/1553299834.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/76877911115637db6195b6ca01675d8c/wiritufafosuju.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/23148747308.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2a97cf09---mojujuxepitedakemame.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/sb3fv7co4hv25e6g1f0mrunqqj/zakat.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/68771810780.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c68925214a4cab05b2306e1dc226447c/xowagirog.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/68418208571.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nd0d3ulcfqqrafpmqaoevtbje6/wexawabegujubotoxu.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/nirinovekizijamomotezu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10b308947---23915198099.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/tevanebizusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ggplot2+package+in+r+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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 10880 bytes
SHA-256: 39a648f48d852bd666bfa9b2c704a3b1a641030cf3beba1567a2bdad563f0969
font_01_sfnt_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 15356 bytes
SHA-256: 97c8b3c48dcf35c9d2bc3bfe668d53236a3ffcfb8634182c811ac16fd66c39a8
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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