Malicious PDF — malware analysis report

Static analysis result for SHA-256 d429d7b05c53d3a6…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 07:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a90895f1e16c78aefa6b4987c3ba6349 SHA-1: 813c2d219ba448edc7062420263e66321dc335ac SHA-256: d429d7b05c53d3a69a5b5261a433a92e1600b55fa7aebb01dad8fa309a62f824
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.institutvzdelavani.cz/files/meremijemosuganimitak.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7012bcd9---tulabakidixokevit.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/37896899236.pdfIn PDF document text
    • http://riversedgefm.com/files/file/sobefofetolezeso.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/tiwiluviwomafa.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/37809503736.pdfIn PDF document text
    • https://cubic.is/userfiles/file/mafelebawavibaru.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/966da0b546ba68113337a4954935c412/pogupazopubakun.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
    • http://cpils.com/userfiles/file/92803735502.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/nefimeruliwagiluvuvorodi.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rewunakipajomubi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611508528c8ac---xenajawago.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/12078933565.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/fuxuzumutevedonu.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/87392198316.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6d23e04a---77634195752.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f9fc9c265---90909785828.pdfIn PDF document text
    • http://htwy.com/upload/file/45384810776.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/zedafikimekuguxu.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/50353496385.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/nozux.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/25d6d559ad1b0d8c3352d7cd75b98dc3/vajolaleze.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5a3b25c2---fodejemoxokazulubowevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=explain+the+topology+used+in+transmitting+the+tv+signalsPDF 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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 17192 bytes
SHA-256: 492158c6da8f305e075aee6eee560c10e9addef84419cd7b352315e3a7d980b6
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 11204 bytes
SHA-256: 8bc8c0cbcc44be3b39a2e844dca15906b56e598d2ceba0b4793f17b810c0e838
font_02_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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