Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fda94e6055ee43…

MALICIOUS

PDF

97.7 KB Created: 2021-09-05 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cabd383d01b42e5c41d6213469967abc SHA-1: 1c1e9796e0006d91448d9185175ddf6762fc9f4e SHA-256: c3fda94e6055ee4320f32830e464670eda4898594e3f8bc15cabbbdd0506cd19
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://philabc.ru/uplcv?utm_term=diana+princess+of+wales+book+pdf PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5d0d7d9b7512484666d36ca0363dd6f8/45831885408.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/19839797182.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/88004390920.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/9714550723.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb311667e---vowenegaxe.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/torafuku.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67ddcbe24---gozaxewume.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/laecjegcj9n2g208en3ai4q12r/42654368024.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/19225874510.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/78563407216.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fcb1b7e6---vamudejogexagowug.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/zilevotamoremajipo.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tefavumaforosul.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b2d8448f1---movujanimanonapif.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8586e6ab87c5a4962dc662e2096f11a3/tazowojelodorili.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d6qmajvj0ccdn9g2qr6qughujr/67842777738.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/13682583440.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/beb8e510b6e82edac53ae4e03abc5b1c/59381588143.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/88657682287.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9df003dbd2a9e338a0f0536792aaa59b/mabusodaz.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/porixugitid.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0c6abish9r3d6c80dorpqefuf1/68077902653.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/konofuleka.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/87764777709.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/musel.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/34931998888.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_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 10836 bytes
SHA-256: a244a38ba8009fe3ec8ef06513dd856b57e85386a39a68a7e1e8f9b14f82ee06
font_02_sfnt_off000146d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D0 19212 bytes
SHA-256: d0c64a70a182f38b0b162ff48fdc3151ac688951b90e1c06d03a558b6fb05622

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