Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc6afb4f4328b00…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 00:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a35b4402695df4c268b1aa8b36ddcde SHA-1: cf5c10d1acb3a6e58e66b6d85424455f6f02bdc4 SHA-256: 3cc6afb4f4328b008e5de5df7e9aba0cfa5768c59a7bfe580b8cca9f1fe0b41a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised websites. The presence of multiple external URIs and a PDF link farm heuristic suggests the document's primary purpose is to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=gry+wy%C5%9Bcigi+android+chomikuj PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xikagoxe.pdfIn PDF document text
    • http://kunbot.com/upload/files/vonov.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/tipifidur.pdfIn PDF document text
    • https://dyaa.club/uploads/file/mabiwagefoziludataxif.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/nobabinezasazonax.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fekenarevemewuve.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/58c2c5e5ffd57ae5a27e709e7b8f2293/kosen.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/29440677224.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96089060d---zatasam.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f08662a37439598d32648aa436874dfa/26908986837.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc45ccc80f---92019398577.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/guzuxijimidezuwivotegumo.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/xukeworojupej.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/timatejidamaralutuzux.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kojidusizo.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pesirezenar.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/degoba.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kawoladu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/vuxonetasoluwajenu.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/dapubemipebepurireko.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/romekamaxoje.pdfIn PDF document text
    • http://skolky.info/foto/images/file/xemijobudilenon.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/dupak.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/75157604122.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/difarexiterababaredogiwar.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/21398430161.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/jutugizewur.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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 17524 bytes
SHA-256: 2dc27154f345e5f559e810666bcbea4b1ada773cb148eb222327147ade22a97e
font_02_sfnt_off0001224e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224E 11120 bytes
SHA-256: 307701349a8cb3816fdd16f50101daa1d71a062dab87023f69074d4aeef4513d

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