Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeca2133168b03f5…

MALICIOUS

PDF

73.3 KB Created: 2021-08-29 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8779aa784b150dd4bf729c60287640b0 SHA-1: 44891c63fd515b3844e4aaf73405f4290777245c SHA-256: aeca2133168b03f5d1b44d62357609a997d290625581f7056288e6938d230343
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bd5056b7---lexoguzomelotamir.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/12e4077fa5cbce91a6d97af2091a4bfb/dovuzasi.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/73284976579.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/72130556709.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/37383925190.pdfIn PDF document text
    • https://ms02bet.com/contents//files/62746917611.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95741193870.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/22216856474.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddae5eb739a---gavifap.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/21d53324d72a3942b905f56040155c8c/nifamupifubaz.pdfIn PDF document text
    • http://devveb.net/userfiles/file/logidegev.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7aaa26978d101617d8d2baa3f5b05b80/59063315968.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/c6bbb9dif5da32pumbv6vhe2p6/natisokajakumibobenusejav.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/be0550820dc5c66f2997a0313c396097/19382813069.pdfIn PDF document text
    • http://e-hane.com/files/64099003638.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/62255542338.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/81717503977.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/denanovozekukogi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14bda940b2---53457782747.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609df968603c2---mitogumitim.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6296b9c92c---gatej.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/worafifizujifimakas.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/97926529753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=using+bmr+to+lose+weightPDF 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_off0000bd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD06 10628 bytes
SHA-256: 6f302816383c022618816290ae0bbafc473f1046d7e4eb7b627b5df9dbc592c0
font_01_sfnt_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 15808 bytes
SHA-256: c386842e8175db58101f5276c0f1154b608d5e8309e16e770616dcf9fac90fd6
font_02_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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