Malicious PDF — malware analysis report

Static analysis result for SHA-256 823c12fd7e1ef8a7…

MALICIOUS

PDF

90.9 KB Created: 2021-08-06 23:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4443ddc7264df671a5fed8642a87ccdf SHA-1: f3e9a7b0212f532a4b591d5f43f95ab00103981c SHA-256: 823c12fd7e1ef8a77a78666b0825128c674bfa1d51ad465289e44b1c9e6a7e8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress sites and utilize UTM parameters, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs suggests the primary attack pattern is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=solidworks+download+gratis+2018 PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723131eb3a8---9671338947.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/46044147878.pdfIn PDF document text
    • http://jump360.co/upload/files/20210607081609.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840f4d2934---73419214556.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/devurukofojibedepuxi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/60141752308.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/buxovevoxug.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f47ed38ebc5a5d4ffe0d1dd54a095c56/89545931154.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab5c8cd5d6---85530286795.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/tagadevatepimedobiguzetim.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/17140521470.pdfIn PDF document text
    • http://polkovnik.su/upload/file/xositebejitefipirotune.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/24080131407.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7ae8c5fea6f5528447634245ea80e2e3/veziziba.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aeb31ff0---pinusolu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5c5890626cd9ed74c8989d6e9896aa42/jujut.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/suvixa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b89909785a6---15511412487.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924954396a1---toridajulameb.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/vamapisurevonafebiwina.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf19159d2c4---dupunoli.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/31511552343.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8af926dd1---83987056085.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/vutopujonuzevefuli.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 11044 bytes
SHA-256: 4112383e8d8f3c9b78ab12b064a49ad20cccb279c76031c7a3b0abc4e561b242
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 17828 bytes
SHA-256: 2064d990ee24c0ee0192a9f7b914205df95250ebb6c6b6731ec9b83da9b87788
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_03_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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