Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02b9a4a6adcb840…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 15:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c39944afc9b05edd0a3929823437d174 SHA-1: 3439c811be0ce1e55a829321115044833a3f598a SHA-256: a02b9a4a6adcb8404d2328cffd5134d8dd5e9b239c360d06a52c7dd56c72b871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://queure.ru/uplcv?utm_term=download+gps+joystick', indicates a lure for downloading a GPS joystick, likely a malicious application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=download+gps+joystick PDF link annotation
    • https://mobile-translator.eu/app/webroot/media/files/2481738949.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210922160850.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nr1bfspq7fbooq3a7p50kr0ahb/nisafalalabozowis.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4513e1b4---31650923434.pdfIn PDF document text
    • http://pk.mo/userfiles/file/25780041333.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/jefigikewe.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/salobakijuvozolexu.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109221807554930.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/14722598930.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c81046e7e---55232178540.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/xakevanaromojal.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/99217619378.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/tizikugufokopin.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/8923908315.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/36415544939.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149e76b65fc0---kowabagubazo.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/59309412065.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/30259219783.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/28950476.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/sapumunavakoluxe.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613afbc8b9a83.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wuzisobo.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_off0000d805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 17960 bytes
SHA-256: c2f89b89909b9e2193304d18c699f701bab739e5c6c86237c1663ff90d6645a0
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 10880 bytes
SHA-256: 21dffaf9a3fb74c093b6fda479b12ff03bfcfa0fa135dae4c1b490806e809fce