Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d5a7960d381e5e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 10:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97341452e9a0451cc786e8455395728c SHA-1: ba8ad437ac923394c37a967e21c1348e8a6f6e0d SHA-256: d5d5a7960d381e5effd615439fd37ed6a62844c21288db9cca0724e1dde9ae58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to WordPress sites that appear to be hosting PDF files, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this document as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=can+you+transfer+game+data+from+android+to+iphone PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d24ea3111a432b47851c6d0a0fca811b/97016584205.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kilibu.pdfIn PDF document text
    • http://canadianrockies.info/files/file/82529243811.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/buwogotinujogaroxi.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/difulol.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/2490356323.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tibogofurenugavemoku.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b12d2d1c1---42575138630.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/bawopu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8b113b8ff86d3b02d177e2621b99bf70/67496145129.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904225743617242.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/romot.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/18896648587.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/tananadatatot.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/69147910139.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ab22417b---jofejopupiluredizipole.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60c67bc68---semafulizazateluxofovawen.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/iq95jd3s5uhh7o4q6sb03r4s83/lajirosem.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/24981886981.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fuwufad.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/kajezegutu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/766b90d3202fe30472e7b2faf35dfc67/pigafu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sunoselerafuxawe.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/kexurinibulikogiralekeluz.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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 11144 bytes
SHA-256: 4786ee9161ba0a86e60cfa9bb27b07743450585fae4ece932f85e91d77dbeccf
font_01_sfnt_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 14944 bytes
SHA-256: afdbdf01a3da477bf321d8ea1c9de98eebc74afd2beec1732043230c8132752e
font_02_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1