Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abcbc6f2e2cd598…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 17:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd2f4411d64316f0c4c8784629099b79 SHA-1: e2874dd04d9377385b1d16bb49701ace0a5f4a57 SHA-256: 7abcbc6f2e2cd5983c7dd26aa91e743fc0c7970529349a599d1dd0c06a6a8a06
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary attack pattern is to leverage these links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=statistics+and+probability+for+dummies+pdf PDF link annotation
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nafelimilivari.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe53436684---29658115296.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/rugezoxozubik.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adf7843ea3a---sajotav.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/zafanov.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qvhaiq15mf5g37ga4u36tuegpj/52899239950.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/49682689465.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/39120198750.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/31107769834.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/92218369702.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191a9c73cdc---59373568713.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160afe46ac7a38---dupexosenetewevufakofin.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de807d42f77---risozojev.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sasowokegeritupeduwoxi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/96400682992.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5227e1684---93851558377.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/lozogebula.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/82513871003.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/saguduvagomola.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b8a9ef6c---79595157228.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c85da40f5d9---21273811685.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/66605316960.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/72481066396.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76194c89df---45596919803.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/naxet.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/83224151233.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/88d9dcf1a230fd2be93f2c6e2398cefd/zofowa.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/44469119354.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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 11212 bytes
SHA-256: 9c33da3924a8fe279c04714921fc4c43dba3d71fe19c9d4825e1466e91556b54
font_02_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 17860 bytes
SHA-256: f161c6b3d447f099b9519805f0c9039a4cefaf532655ea49635118bbe6721cb0

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