Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34d90f10a88a90f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-22 15:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59bbcd7e25344c7d51393255d526680 SHA-1: 50e92bbbbcde0ed600fe3ebec71fc56df75b391e SHA-256: d34d90f10a88a90fc0e642e09f573636ef965f5b7c4671c353eb251b079e3581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the link farm nature and use of disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=vidmate+apk+for+ipad
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/sufexixajupu.pdf
    • https://hung168.tw/UserFiles/files/sodazetebu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322797ce730---21403076575.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/41212654326.pdf
    • http://doubles301.jp/files/ckeditor/files/75855397204.pdf
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/wigupupavobixefuk.pdf
    • http://originalcheck.it/public/img_admin/file///tobolapakibivoxopalusebot.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f13760c5b---24473153357.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/86983130837.pdf
    • http://markone-tools.com/upload/files/29816147887.pdf
    • http://asfalon.com/__files/file/16831945830.pdf
    • https://durimawar.com/contents/files/pumoden.pdf
    • http://shiny-baby.com/fileimage/file/31578898968.pdf
    • https://bodzlomu.com/userfiles/file/353335504.pdf
    • http://mitcostruttori.it/userfiles/files/94819333322.pdf
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/31025927259.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/46386923059.pdf
    • https://ihappywash.com/uploads/files/202109071431406536.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/43416474271.pdf
    • https://campermagazine.tv/public/file/favutugin.pdf
    • http://adhdesign.de/userContent/files/20210920150735-71417689812.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378900e2e27---jakuforonewarir.pdf
    • http://bytip.net/filespath/files/20210905123610.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148976057e18---57482427788.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_off0000b316.bin
dcf439682da1edf24aa64e0c3d87c8efd065a44008ff8f9e88a35945118e4bef
pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 14908 bytes
font_01_sfnt_off0000d8bb.bin
5295cf181aecd02ea9f1a1aac9ec7b389aea2f1788f4954294390121d78531fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 10404 bytes
font_02_sfnt_off0000f04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16792 bytes