Malicious PDF — malware analysis report

Static analysis result for SHA-256 0675101a8cbb8a96…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 00:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1814dacf5a4317d056e3849b2bf6c91 SHA-1: 002c0f37268bec77ed7f6af48d994367af45cd54 SHA-256: 0675101a8cbb8a960be28dc29499eb474ba71f9ad97739239d56f265ff7a0554
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fbdbbb7049f2d063f5669210a2cd3440/tijaramed.pdf
    • http://karunb.com/UpLoads/files/vapisevilosurojawafe.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9f571c82---54937717035.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/68c11f1b238829c1d0fc9ff77347e694/kukizigum.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a0baf09372ec7abd8ee5f33ca83c73da/gudodobe.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e10de28---voririvoga.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072016c5ad6e---mejokexilitus.pdf
    • http://euredit-editions.com/userfiles/file/38421123799.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3c3391f6aedc60ea8e85024ea08cba77/xuxevowom.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dhqvgm6g9q6qhel6l45olms1o0/29735143708.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/wirefij.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/a5b7tec72tl9g5avf81m0q6p59/62657160376.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87c55a1fd---11304899198.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607903e481183---90228135455.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bd7aaf77---mibakiposefabupozusiw.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dan7f91dg2b7o806bp9u4lrsdp/kikerixudixuluxi.pdf
    • http://pinetreerealty.ca/clients/55933/File/zidaxewutujome.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ec25a44a---wumosasoboburak.pdf
    • http://teenaramainc.org/clients/875997/File/56682145893.pdf
    • https://isosklo.cz/uploads/jodumibemidafopagi.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d21683768054a8702651fef63498bd28/gokivava.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87d38b71e---mobep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unshrink+fabric
    • 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_off0000f3b1.bin
eceebfbc3e0e16b68e96053364248a728c23444b6301ae40db5dc79ad15d0e93
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10664 bytes
font_01_sfnt_off00010c1e.bin
e6a36313bb308da2708d8a519ac328c026fc8ad23804169597135cc5664c942d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 17360 bytes
font_02_sfnt_off0001394a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 16792 bytes