Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fcc94a66e4ae4f…

MALICIOUS

PDF

84.7 KB Created: 2021-08-23 14:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be86fa112ffef44ee85b48c0d1232304 SHA-1: 8203010bc67010284fae633c14d14eb81c9fb57f SHA-256: 50fcc94a66e4ae4f5579c76bf3bdaffc3451c5d3039e1f4736b732e77c1e2a00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=cast+of+importance+of+being+earnest PDF link annotation
    • http://sibinetweek.ru/userfiles/file/35149039087.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd75356d20---35138321766.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wakatemubipiberalibal.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/32707937711.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/ranixadetulojedarexute.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/52d54bd4f8cf5cc1ce936508e6e4c858/48778642042.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5edcb6f11a3952751d95ea3d3f4c2705/95127811124.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/zidajili.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de3b82afa---ruwemupavex.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fc09d9bbecba9a74fa39f6e336d5a988/18953581330.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/jusaderawedupoxetam.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f581b9a6ee24991524f48201ec1a2a88/mujexerineforari.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/xujusivanabiw.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ca163edd---90732457104.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/51767108961.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/lijeb.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fotinopabukadexubaraboz.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b31b293b1---54879499634.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/86985007147.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/48989867131.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/fisizetolugedopokisinada.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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 17912 bytes
SHA-256: 6f19f1220ac3725e6730f49ebb623e5e572704e36d026a4683ba429867578a29
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 10948 bytes
SHA-256: 96d2f59128e891f020bfa1b33398afbd6ab24b16c60703bb7c6adb13ba753e01
font_02_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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