Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea611302dd6d48…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 20:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9108be6d02a8082d5daeb2f5c59d8969 SHA-1: d68dda9efc09072b9a6ed20603c0c8bd209ab14e SHA-256: 99ea611302dd6d481d70a19ea47d93e1f4f01a2586d02fbea35883a635e70b6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic, to disguise clickable links. Heuristics indicate it functions as a link farm, directing users to various external domains, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=god+of+war+1+free+download+for+android PDF link annotation
    • http://theclubburger.com/uploads/files/sapugefogufoti.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/7617026973.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/75101074952.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/27302746614.pdfIn PDF document text
    • https://businesslife.com/content/file/dutedetulabade.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2fc1d1ee---2945213360.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/xusipuluwaxorivisas.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bik9dtg7ofqprlvt1sls3ldf6s/lazezabatete.pdfIn PDF document text
    • https://e-room.co/userfiles/file/39159906494.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/23149239162.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vovigobisapinimurogowo.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/riwewokutagosa.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/22172623256.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613944bb4fa39---tibas.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nupovefonaw.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///67487326999.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/34895377207.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/37555558249.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/dekedoz.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80115445553.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/fixulilizubolifilonam.pdfIn PDF document text
    • http://hueide.com/upload/files/40122740787.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/japagorigevilifozap.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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 10260 bytes
SHA-256: 50821c49b63e79bb2f05591e9920699f9b105b225cf609eca5adee4ae7c6577d
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 14208 bytes
SHA-256: 6af1b6ad7032030223f5011ac249b971e4b3efaeed7f5c94d0cdb06a5ce3ad49
font_02_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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