Malicious PDF — malware analysis report

Static analysis result for SHA-256 855d28ceaaf6a262…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 17:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf945f41efafc0b3c58bba64afbf48a2 SHA-1: dcfa8f65bc551d57c2405801c6c0c01c12acfe91 SHA-256: 855d28ceaaf6a2628e4b850a023850cd3ec489bbdbe204b791a304b5f172dc88
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://minlinart.com/archive/upload/files/24707939346.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e7df1188742aefebf14353ed72563847/zoxukaxezapigogosuw.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/senemoselejudipitojud.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/74689a368f9950fa5c6d3001c0dac4e8/79408169746.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jesudewipulazixetenifasez.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117e8ba505a6---14605546462.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/9176227232.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/nuviwivovelikikizifalofa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pa2juqe3jdb67b5o6vmqshk2c7/robojovosiwimoniwuxenexof.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f27d9d225---narilaniv.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/gefin.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9c5b1ce02---gijavalivod.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb8db0853---fepisimakalisotaxodol.pdfIn PDF document text
    • https://makenie.com/upload/files/73688786741.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/guzebedefemuged.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/wimevumukavoraxojeb.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/48896094183.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/56063112379.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/9019936414.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nunopavufosusegirul.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jenipsgo2jssufkpf75rkle4r4/tumokobajufevobo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5d9a64460ca3ab1fab0f48a8dfe5ea06/loselagokit.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/4913513615.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/lopunij.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/41624214784.pdfIn PDF document text
    • https://isosklo.cz/uploads/tozixawozewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=electrolux+combi+oven+service+manualPDF 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_off0000b69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 10784 bytes
SHA-256: 492e19fb4edf022b09b7c07fa6d54efdff727607846b2493061a50dda68ee365
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 15768 bytes
SHA-256: ea72a7ca2c4dcd54a800f8aa6be3b6a2c0b9c54a76f5ffd3b00d69b7544cb71d
font_02_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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