Malicious PDF — malware analysis report

Static analysis result for SHA-256 21085dd13dc10b74…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 23:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8075bd3e0f95f3d43ad5de491d53eb2f SHA-1: c12577283c12f343302cff312a2a7d2f8d742d50 SHA-256: 21085dd13dc10b74c2ce4e33fde6b3b743776670b0c1120edb454a217caf09b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest a phishing or trojan payload. The file's structure and numerous links suggest it is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=types+of+educational+planning+pdf PDF link annotation
    • http://greenworx.eu/images/uploads/files/97434827112.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/62229814832.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/ritekixaxixar.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1efb3fad---79913915109.pdfIn PDF document text
    • https://webhosting4.net/media/file/79899952467.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9bcc6a303---40192893835.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104edcdbe90a---70904705733.pdfIn PDF document text
    • http://elskenecologie.nl/files/fanakuzivorezekuxevadok.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc0b3825d9---fusabofilu.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/mojitiremitesizi.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/uk9m4qqv5ob2mf6ae60b8vup0k/62370681774.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/11745219254.pdfIn PDF document text
    • https://tipresentoio.it/images/file/56897318141.pdfIn PDF document text
    • http://immopolignano.lu/images/11931491729.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/68030474283.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ngq33pj3hi3dm0ong735m807ct/84609614391.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f07461f8f7055f2146658be42792b9e8/dutumupijada.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/mixuxovuwomuxujowo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834254724d9---lakoxomilawawodifusitig.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba528de30d1---17846516794.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/mekatojekiki.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/37821077318.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/tebokamujokomagomowu.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_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 10872 bytes
SHA-256: 9315fb1517da0ea607a1ff369ce257d92ba8472059a16ae55786a3845b93386c
font_01_sfnt_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 16876 bytes
SHA-256: dc73971e9d0076f46a50fbaa6ce67383ea26120fc77c27872992e8dc6a8719ea
font_02_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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