Malicious PDF — malware analysis report

Static analysis result for SHA-256 76905994c092fa66…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 21:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfe9d472f06fbd8e2164c7014cd1b13f SHA-1: 9154dfbe9ec54c9b9073bc9efef38606685a3b49 SHA-256: 76905994c092fa66a6291b817d2fa3865bf027386723251ea2b66807f48d0d8a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The primary purpose appears to be leading users to potentially malicious or phishing websites, as suggested by the URL parameters like 'restore+deleted+files+from+android+phone'. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=restore+deleted+files+from+android+phone PDF link annotation
    • https://associazionemusicaviva.it/uploads/file/90742603960.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wobinaxevulupok.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/63461027725.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/84210374684.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/8567874311.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3a5ca24c---xojakukaxigekalirivawival.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v06aj9hqrh1cnnen78fh24230r/gazijeginogivoxu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ae4ea3a2---binasodividipewidix.pdfIn PDF document text
    • http://shopabrang.com/images/files/luweburukatezafol.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fb415ee5---demuxerisemofonojofox.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/dudidoporu.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/24478437161.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vadolizodito.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/35691418923.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/lisidipokidipupodowupivim.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161395c3625127---xemororip.pdfIn PDF document text
    • http://yuha.be/_files/file/jixewobexifak.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff21a7d685---64793053810.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c598a40a3b---kemuneme.pdfIn PDF document text
    • http://ruresept.ru/files/file/41874887116.pdfIn PDF document text
    • https://thehouseproduction.net/file/98850530275.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/10300267973.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bitovedal.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/nakofajiwe.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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 10808 bytes
SHA-256: 646edee478ed59d2e4802fd26c4b5b837d5446035ca32fc66aaf79fe9eba301d
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17708 bytes
SHA-256: 5798975e029c0544ac515228cb0b7b377ba67ba6688ede7e2a34f65f5ed10845
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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