Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cbfef134a5f9bb…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 20:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89e74ed286d1923f7d9efa512643a348 SHA-1: d90e23ec7add046a610b53410def79bc5b2d188a SHA-256: 61cbfef134a5f9bb79ef46aa5ba3309228b6692c9c363e4721e59a98fd5ab8ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute phishing or malware content. The PDF's structure and the presence of multiple external links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=the+unhoneymooners+read+online+pdf PDF link annotation
    • http://ibshop.gr/uploads/_uploads/files/37199402874.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7759d8fe1---rutarexifazixiso.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c2abebea24fb2092ac9e9af62b80a618/pakixanufilixer.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/73254810705.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/85632747609.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48500428565.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/witupixonemum.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32e93248d---jopojusizitibisun.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/46139994230.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/45339714779.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/9195767382.pdfIn PDF document text
    • https://austarpharma.com/upload/files/55212912716.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/2009369902.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/921c1ca950ea2ca1aec91d44b289a834/28628880199.pdfIn PDF document text
    • http://js-space.de/userfiles/file/zoxazemirukisa.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77269338164.pdfIn PDF document text
    • https://masukpt1.com/contents/files/34738643912.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/kinulozimutuxigumanina.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wazunu.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/ropuwejimi.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/13149441783.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/47388613744.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/50852997877.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/34695501813.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a18a2b8c2---buxepeno.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10844 bytes
SHA-256: 89be6d17254d4d6c3a47c379778041b8a6c11ea78701cdf987727d7528bb176e
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 18292 bytes
SHA-256: 1e568a4fc1bc7ca8909b8181482238aa1f974e1892796047baa5c2e4dd5ed4a2
font_02_sfnt_off000133cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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