Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa726dea4a8f3a67…

MALICIOUS

PDF

77.0 KB Created: 2021-09-23 05:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa4c152b5da171742b076b1e45e4dee4 SHA-1: 17d2d6a207fc59f8820c26e3aa3c611c4fa22b74 SHA-256: aa726dea4a8f3a67a37b420d1a28d4a6dd0607282b9f220f57e202502e5a5b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=malleus+maleficarum+pdf+original PDF link annotation
    • http://jcpingie.be/public/files/fuxag.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/48132963334.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/16724527691.pdfIn PDF document text
    • http://lse.hu/userfiles/file/lukave.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614511322bec2---wejogosadovikerusup.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/72747803226.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/89977600097.pdfIn PDF document text
    • http://scarpatti.com/files/xojidosumutezolox.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907023819924086.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/62173662731.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/25956375595.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613000aec5---marumunuligavukalebo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/29733404421.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dufikuledapofixagen.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/xomuloliwel.pdfIn PDF document text
    • http://eternoohydro.com/d/files/jibejuf.pdfIn PDF document text
    • http://hidropro.hu/upload/78015586431.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/15822693047.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/88852267518.pdfIn PDF document text
    • https://qnzar.com/files/webofanosutaf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d6613807c---nijezivuzupuzikotoge.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/tagamatamujolunegil.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/50719246326.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/gutolegumivuk.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/perenezimodoseje.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/62256988122.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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 10960 bytes
SHA-256: f8a87c137dd349f1c63ee39d9c93f452f611d24064220a8d1a648fc0e131f3ae
font_02_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 18392 bytes
SHA-256: a07137b56eff9ae3558f0285f88ab0731577e5fe72e3152013f16495f3104e06

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