Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fef1eb07d1cf53…

MALICIOUS

PDF

93.4 KB Created: 2021-06-25 21:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 864f074f0002d8c782bae793c17cc5e6 SHA-1: b1a31f7771e062f436d073b87804141c072a64f5 SHA-256: d0fef1eb07d1cf533a14b1b872b4b81dc84bd3e64cb2290826b9e0a7b8f8aef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://chcial.ru/uplcv?utm_term=graphing+linear+inequalities+calculator PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/79930394466.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/55791652712.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b7e1c13c961069b5d6793214ceeac7c1/jolujizonezarozinug.pdfIn PDF document text
    • https://actorconseil.com/files/file/95226572659.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/2499941168.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/505bb708c3e4a189f3596c5302b2e4e1/31887542948.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/53812521946.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pixatosad.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/sekof.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160893de8e8660---95287007315.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a243e69bcf2---felemavobuzisovutarizuzuk.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/e31k933bvqs3r216s1tkmrlpu3/52890582604.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/xugogidironebara.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4ce972476702147d1320e17f18269478/kixaguvebesodorutodalok.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6664d6456---94898714522.pdfIn PDF document text
    • http://vodnik48.ru/content/file/91470707482.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5b0cc04f---41263207428.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/wanawovevopawesotaledu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nokobagobatugomu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b058a5c93b---xawazibadezeta.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094478e45007---67083073611.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/99777079294.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/1883998363.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/84689877045.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff4e5c422---48107915900.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_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 10940 bytes
SHA-256: 2638ac655c8ddb369d737b3b13ff0b348081f4e173b72373129ffa371fb55b92
font_02_sfnt_off000139ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CE 17592 bytes
SHA-256: dcf44e10dadef2ecc10f10ec9c0650b9800b646c04f53020ecf0b2954a72e85b

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