Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d6ee036006c250…

MALICIOUS

PDF

77.6 KB Created: 2021-08-27 21:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd4ce2b85657d38d92b8181301d051d1 SHA-1: 545f29958c56e46beb033b51d2837e69261dd73c SHA-256: d9d6ee036006c250eaacbdb01158f1a1f03f2dc162d7aa8ebecb735e902bd381
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jjc-dev.com/userfiles/file/97402144287.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/piwakipikuromijowave.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/20534547082.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fef31cdf---zanaxobavoxijaliseki.pdfIn PDF document text
    • http://serting.eu/userfiles/files/vajoligimagu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lezixoxupowo.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/vixotemujinifaw.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/diwumivigopo.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/dewijezowasatakibuwij.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4a3fe64ab8332831bd904710c80214bd/42876483447.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/moxatalozamupifogobeviji.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b15a75b6791---57966829016.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe8c3dafc---62426444018.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085067db7b32---60410518744.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/13687782380.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/17557882998.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/bijuwex.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/11c2f5f8d54faa46ef872ce7c3f996af/zilinexakab.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5im6qlpjpj7j3uevn79s60aack/49827108131.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/divoluj.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2e47844a---46517837442.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/91605531123.pdfIn PDF document text
    • http://otczenacts.com/media/files/15305639690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+v+for+vendetta+online+free+no+downloadPDF 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_off0000ca5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 18064 bytes
SHA-256: 89db6404011d2b399e99096f3a146019a7968ca6daa9015b6a589d856e8f877b
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10548 bytes
SHA-256: 097d25f0fd2f20be84e22ea98e566e19c1850744e87d55b76b2b6747ec5e02b8
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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