Malicious PDF — malware analysis report

Static analysis result for SHA-256 8916ccba94658492…

MALICIOUS

PDF

70.3 KB Created: 2021-08-28 22:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9103dbf0c6d5f0ddb6025a92e336e54f SHA-1: 7b4c6b71d41a38dad12d486d7ec2d3ab4ea59ce0 SHA-256: 8916ccba9465849200ac26e5ffbf1fd65b42863bb3437fbafd78adf1bee9fd79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fed402d78---89210415647.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/52503353411.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o0h96k92df99uqoue101f6okqa/bezadu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/36575778275.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/88669861091.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210706_171018.pdfIn PDF document text
    • https://serka.com/serka/upload/files/tebikebekogurusimazenogug.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rvanqdth9o9u0e2kpr64fg24/48607388328.pdfIn PDF document text
    • http://ipublicity.cz/data/file/puvup.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/48449945943.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e9f876d59e4a78d681e00726e5b1dd3f/pifadaxixo.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/ponasa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a1fedbe5c43c0b9e90bed67ac3d5e1ed/zujep.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/27019168142.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611673de84853---80540528198.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bisuzavula.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8d2431fecdfd56bc26a6b797a0146c32/96526871843.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/64855720358.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2829ce7d---luketawekemewijugilig.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/80334789820.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/xiwotitubinepibetosomo.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/62802939663.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483eb9c494---95532585758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+big+blue+audio+bluetoothPDF link annotation
    • 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_off0000b691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 10696 bytes
SHA-256: 1736b7e76886926f2c3cb54ba17e3e4a9410c1a6fe65b498f08c7d4c459d4787
font_02_sfnt_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 14604 bytes
SHA-256: 0fcf3663c3d25db7feaff7832629fe05db9b53d154ca2856ca6128becca60dd9

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