Malicious PDF — malware analysis report

Static analysis result for SHA-256 2646a912f9619648…

MALICIOUS

PDF

93.6 KB Created: 2021-09-18 12:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c89a4e9b2b2246ca0916b84bebc1c784 SHA-1: 02b3777497a2dcbd766d9656deee132b2b75aac8 SHA-256: 2646a912f9619648b64f042d9af13f20deae89c29f952ed9db43f92ad4999227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final malicious destination. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme, where users are lured to click on links that ultimately lead to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crewmak.ru/uplcv?utm_term=the+four+hour+work+week+full+book+pdf+download PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614061491d2d1---bupuxolov.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/zuxekaveko.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/68568131961.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/doranakaxovi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/58475726297.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/93658207458.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/linawovegemetimabisa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33fc00d79---3887701923.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f58ec1c5---riwonozokokexuj.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210907_064916.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/dabaf.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/66828623726.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/wijisaliv.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/donavepadakokoximeso.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/lenefafupogiseg.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/17432888057.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/75246970524.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/52908113343.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/99198873360.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/mipedefakeg.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/53741170801.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/1179940480.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/12604042355.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_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 19296 bytes
SHA-256: 271d8533ef2b03e4443de621776a945960383904eb54579da523a6a2de78a94f
font_01_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001509b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509B 10616 bytes
SHA-256: b8e309d2739bbded67aeaccb6ad2fdec68ccf90dd6c2b74c392b534f6bec6e7f