Malicious PDF — malware analysis report

Static analysis result for SHA-256 b454831fb6f19fbb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 11:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8394ada733890780f31be9004d3b68e1 SHA-1: e180ac1917712e2bd244eb7556e9837b5ba70f0d SHA-256: b454831fb6f19fbbe13139eb7b4e28e0b58334959e8137b26864eb467a7c6c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, with one specific URL hosted on a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rainbowprinter.com/app/webroot/files/file/88386443975.pdf In PDF document text
    • http://radecznica.pl/userfiles/file/17799636234.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/61702057913.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/zekagan.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/nagovogotisifenixagase.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/61263255508.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132e18101a2c---gegirejag.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/36483035462.pdfIn PDF document text
    • http://okvin.org/userfiles/file/madadi.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tazin.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/6347060459.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/23316306951.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dc3c27a54---motipulimutazosilason.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/26366350066.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/pasaj.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144a848477cd---kefudozuda.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/90208561375.pdfIn PDF document text
    • http://npas.ru/pic/file/63687458808.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/1911130334.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/97956812425.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/tapujizoba.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/23050875252.pdfIn PDF document text
    • http://446888.top/userfiles/file/48954383628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+se+not+receiving+textsPDF 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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 16772 bytes
SHA-256: 0015176dd139e224bda4e4123bfd991578a047880e51494c8788c35232f3761a
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 10564 bytes
SHA-256: bba6e83b40b9491bef8a6b2cd9164da81edc2d531c13ea41b7e7e6fbf6ef46bf