Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b5a99e35ea0fb3…

MALICIOUS

PDF

159.3 KB Created: 2021-07-04 18:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a40c0024a71d80c5dfc252b9ac14976b SHA-1: dbaf3e5f7d5a4edf83eaf52ee8cad9caba3128e5 SHA-256: f2b5a99e35ea0fb38be3cce44881c5233d6d5f966594a26bb8c2890a92724935
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a tactic to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://taeguektour.com/FileData/ckfinder/files/20210615_90E67FC7516CCFC6.pdf In PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/worabojaduve.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052818013044.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/71142936805.pdfIn PDF document text
    • https://mollis.rs//files/vavibamiku.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d47321d697f61ab841f368775841b547/66602149672.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835989cc5f7---tevowapesajenedulu.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/21616662251.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7cbf8c5d62dd3fdc1523b2086e07b911/13824807939.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/24e8505c6b6a559cafaee142fa4c5700/55203396634.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/xabibogenejiwujikusimipa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u45uirjoi3p2m27bmbhadkif79/midutuvakozumanoramuzisal.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49325520092.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/95067396981.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/94047307055.pdfIn PDF document text
    • http://digifast.cz/userfiles/rusowilizugin.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ruxuzaxefatil.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160766862275e9---12467727353.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/1c3e5bd92db963da55c1f7d33e097c03/421473263.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bc9998d76f4ea262344d305b20506a6e/zokamidokitoxosaxovuvalu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be02649dc---kazujapiwu.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c127b90393f24dce37a288300e038ec0/morafozimunapene.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1c85c6bce02792244d9821e733b19900/19197873717.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o1qblb9cb0em1te273731kl8na/32365363708.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea6b7861f---26019125606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bud+spencer+e+terence+hill+moviesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22618 10836 bytes
SHA-256: 293e088eeba86313fe0416a05b1143eb58a26e641cf6a16569ae0dda3bf8c70f
font_02_sfnt_off00023ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EE7 19204 bytes
SHA-256: 1393d9259cac3ab683cc13c3e6d9b3b7081d8f1753b872bf5c8a80ac9ee55718

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