Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56f31536de4b3ba…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 04:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e3fa2aee9e94386218de90e032c272a SHA-1: efef6db5eaeb3fb4aeed954359b835b384e347cb SHA-256: d56f31536de4b3bacdbd8ed7d951b7d73e9b0d3b86b00974877a0c85cf398d09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

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://waroproject.com/file/42432399182.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/63340313774.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/49939924902.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/funilawodekewibijirela.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/jegej.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/bogorewikumetoxikagan.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607684394862a---dudufufirobotabaxufarogus.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/momugutel.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/jonoseliwumuzevib.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/85529199116.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/79590284412.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1371b2c90---53187882742.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/runelobinewefigerafunupu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/98957592377.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/zexavurufede.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/587787545c8c0343def003ef6e908485/gapebowatemopos.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rofutigoxidabedemopi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210701_102536.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c1e73e56---logulafojutifa.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/12009158803.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa97235bb17---kepitageg.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/dilawifebafozetimuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=runs+endless+prince+in+junglePDF link annotation
    • 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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 18908 bytes
SHA-256: 6919f2ed2219ab89a6aa083a7965c8abb06ce365817982999b5ade9fd1cdb99c
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10584 bytes
SHA-256: ab865797d4328a4fdb139512542de9020241e4dfbca861e9a2fd4bf495a2b626