Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1546e122494768f…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 11:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e582f431ef0b4741ec22b0174410f41 SHA-1: 75c2959ac705d29e9c08b71b6cb4fcdabeabd80a SHA-256: c1546e122494768f3bc818d8ce5acd599ad935435547b15d3f661b71d1195b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://drafthe.ru/uplcv?utm_term=how+to+connect+android+box+to+pc+via+hdmi
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/309ff6f7e9fb7b25acac2b1c131d8527/zunegujujen.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/93133729b84bff4449e0026db1dc8154/52369530429.pdf
    • https://rlmahtani.com/userfiles/files/xojaluva.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ginedorileku.pdf
    • http://5m-tti.com/uploads/image/files/80737852355.pdf
    • https://v-rshine.com/upload/images/files/jitowozebi.pdf
    • http://rayer.cn/d/files/57450227631.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021091821024873499.pdf
    • http://www.lovebliss.tw/UserFiles/files/7592888589.pdf
    • http://belv.ru/userfiles/file/57295648379.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/kawifomipetopi.pdf
    • https://srmhomes.com/images/bulk_images/files/76481135943.pdf
    • https://gad-elhak.com/userfiles/file/38148312287.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/diduguxetalitodidaxiri.pdf
    • http://otpetye.com/images/shared/file/memazo.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6fd2a893---23644352148.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/56856574284.pdf
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/dabunulobujawetosiri.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d7b715828a1a0d3862142ac99efc6567/salewev.pdf
    • https://vinacomvietnam.vn/uploads/news_file/57128703465.pdf
    • https://leciv.fr/uploads/FCK_files/file/65790751681.pdf
    • http://commandhousecreations.com/uploads/files/fejezixemajaz.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/apufo1nqopeafv6sngnmshkbu4/tivukiwabomofabafazaxu.pdf
    • https://chongtham68.com/app/webroot/uploads/files/pakanijatupinagifubo.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff659d904f---2422140935.pdf
    • http://kachelofen-prommegger.at/bizapijej.pdf
    • 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_off0000b9b8.bin
3d9153879d2a894da20c68d997ca674d821274e8b6312a5b85eabe0830635c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B8 19052 bytes
font_01_sfnt_off0000ea0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
font_02_sfnt_off00010224.bin
eb8071f56b22e7945be2189e6b2ca80c9c1396fe0074583deee85eec252aace1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10948 bytes