Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c869ffb9115478…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 05:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffc19f58ec5b205d3aac36bf0bfc4fd9 SHA-1: f015fe40546d96ed3eb1aa95c18da359aca8c92f SHA-256: 89c869ffb9115478860f4e85add461039e5e2e6f24820bf16c2eb87c96391d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users into phishing scams or download further malware. The presence of external URIs and the link farm structure strongly suggest a phishing or distribution vector.

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://huntic.ru/uplcv?utm_term=geometry+olympiad+problems+and+solutions+pdf PDF link annotation
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4d38a02b---40290896866.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/64397119405.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/95437702094.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c093d613d6d---foluviganasezawatadaxuro.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c5a69e2c6ce6e87d1d9ab62db0537f7f/49074845388.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e8931cfb---17198892572.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ptjm1jp9dmfk1dc3493r9oh901/60036377020.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zabiwisalirotupezaso.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/47504307284.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/apofazusafidibo.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/jopenejidix.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6r13doepsakbe15ktaqpgk9m2d/68397232086.pdfIn PDF document text
    • https://bataretak.com/img/files/file/vilifi.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/wixagabagofuxeregil.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2a80be325f2a3a371eaf72bc85f2ff42/mavifusedudagogizugakitap.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/434d0ec106598a2c305ed8b915e1cded/75855750607.pdfIn PDF document text
    • http://linardi.ru/files/file/2630990925.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/88a8e7768bb7b5a72b402894e3827d95/buboworatuvokotijexa.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/pabefuf.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108190220255266.pdfIn PDF document text
    • https://grancom.by/upload/docs/30323333396.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d1f547eb20127e9d4a9088eb649ab501/zojuguxurujoxupo.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_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 19576 bytes
SHA-256: 6fea8e698312749183388cfbf251fdcc6f197196896a94bc43d98a5ad7daa411
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 11052 bytes
SHA-256: d4ad49faf7a1f455a4f8196b05264467779c7efecd6cbc820a170f04a39827cd

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