Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d595bf4b031f78c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 10:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7180b0db35923aad874eb50047c408aa SHA-1: a6e5ba5cf19ddfa8b912f7006d8ab87430fde729 SHA-256: 2d595bf4b031f78c8b807e3501742ef9ff69d89b6c00759949b48cbe8db0c45a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or directing users to exploit kits. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://expresskaliski.info/file/zalelewudo.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8ff07f3a---tatujelem.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d01f519ba---28449315056.pdfIn PDF document text
    • https://lemanssrl.it/file/36780227766.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b9c67358---72683331526.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8510472d78---24397590983.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/434b165a54e6ac4f778c9d83babb6496/gipamaxikitewew.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/14244704880.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6e8f2bcf16811523f9d1d903b29e70b7/54551612766.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e160cc61---26363108427.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e4f7567f---8924351501.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944a86147a3---96907689426.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bd08e1070f682c705df97085e25ecbe3/57081931629.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/23916949359.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2a8d494cf3ca46f7219fbe0043859f47/87376956416.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lusivamudupudoxufijonobop.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/4141303647.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/tozebuzila.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/xanuvani.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90ca296dd---koxufo.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/31357186408.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/46898949970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bs6+fuel+injection+systemPDF 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_off0000bf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF70 10800 bytes
SHA-256: fe8724be973c8205fc23b7e6c0384be63e5db1e20414b9ffbc26f1a43c7b3d53
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 15560 bytes
SHA-256: cccf2c99ff6f6c05a191a57ae5954aad13154f5097a47095de9169a0994d838d
font_02_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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