Malicious PDF — malware analysis report

Static analysis result for SHA-256 2817ed1154c2ccc1…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 09:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa74c612f32fc9f2cd55900bbcd4cdd7 SHA-1: 56dd3ce2cc8d5a6fdf71bace5a8d3c45859be877 SHA-256: 2817ed1154c2ccc18424e56241aebd96b1922b500076e7af98603001f5767c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://irlanc.ru/uplcv?utm_term=timothee+and+eiza PDF link annotation
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/73d33a188cf60957e733a04b2982fd15/31829253771.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/solibezeduzokojajaximapi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160addec23dd26---54158071118.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/94828d62a223dc8a3bb466f5dc3002c4/2972518375.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/48191826953c5c6e13f52c926499fb58/zomem.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f1e94f4f32ad50f772ddfefdb4c57cc/71555818285.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c4206b685c5dfa5e2c1ee73de5d3c19c/5570709674.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vifewowudedutazope.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/77706490834.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b407d9642c2---1865322947.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6d8ab4a1---sesupinedigekuzarojigun.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/63072679092.pdfIn PDF document text
    • http://tipiland.net/upload/file/tukovobidifixajukedowi.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/30416463232.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/68643446962.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/joluzaguwumerip.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6ogfv3eiph7hlbp8j6u4gkflg0/76486418054.pdfIn PDF document text
    • https://deepex.hu/hirek/files/88814132052.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/66326509442.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083424ad04ff---79265557546.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2c09395e---21915561090.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060800332893.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4d8aae387b824f1f1ec5b7b5ca7d9771/tezobibejafasodozu.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://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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 17464 bytes
SHA-256: b6d29fd80889d590a32ab1d6bf004400cd536bd8f743e65456f688c3568d083c
font_01_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 10220 bytes
SHA-256: c229091bc40008887621b9de3159172a4628eae01e2033aa73a35d963a32f910
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1