Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fc224254470ab0…

MALICIOUS

PDF

88.8 KB Created: 2021-07-24 01:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60442f79df43d27189bf24fb5c0056ca SHA-1: 0db9bb5a5f31472418a179eea4fea8800e0059b1 SHA-256: c4fc224254470ab0b97ed801b65f533f9536e2169ad96b9c65323ebb5fa03b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the URL structure is sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9ppgi01jhnq9hlecr18v2gid22/57526808097.pdf
    • http://jtg-antracyt.pl/files/file/49697746333.pdf
    • http://synerfreight.com/syner_upload/images/files/53828861015.pdf
    • http://bmcnx.com/userfiles/file/56585251633.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a0cabd1ef158e94e58fe47f39f4adc48/xigopeviwadesovufasos.pdf
    • http://centronegozi.com/public/32369100245.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f9e08903---70513548947.pdf
    • http://turinhotelcompany.com/userfiles/files/kevuxunedane.pdf
    • http://ore-processing.ru/d/files/xemiveta.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607267c809f83---50532405070.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/o9jmn6sos47evgh17tj3lgmjqr/wuwolisobaritaxa.pdf
    • https://dm288.rs/slicice/file/jebofumif.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3d06109aa0de9ca207c83ac388a4c5e3/pugegeborujeruruxigi.pdf
    • https://alnahamgroup.com/userfiles/file/59946218326.pdf
    • http://ausafe.net/images/art/files/wemekunakupodosolazize.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239326e682---dikijebaxalegewokinib.pdf
    • http://originalcheck.it/public/img_admin/file///58747866930.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nhd03spbeg82p1dulo58ndu143/letedeg.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5d5ba9cc258ef5840b59b81c2f5f8bff/mokovabem.pdf
    • http://geometrabottero.it/userfiles/files/34219116307.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/foselonapenekex.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816f800f76a---7621733263.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=onbathu+kolum+mp3+song+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54c.bin
210a84db5ccf44fe8c52c3ced2713411901ae7587d8659f14c1d441857f7f6ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11468 bytes
font_01_sfnt_off00010fe9.bin
16defe116230d4b320283d0349af67e3e9d8041303b45c50d0d74fd777c18074
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 17096 bytes
font_02_sfnt_off00013cbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBD 16792 bytes