Malicious PDF — malware analysis report

Static analysis result for SHA-256 57467ed7039a521f…

MALICIOUS

PDF

86.3 KB Created: 2021-08-11 03:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca18ba5fe6220024ae152ced7dd58d18 SHA-1: cfe0a6122e32255bdd57d682f3f48798f514d2ff SHA-256: 57467ed7039a521f0ca19d9676194e9adc073a30b8c9f5a4a7f13ffdbac991ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=pubg+mobile+lite+hack+android+2020+mod PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e4654bb8a06---nugixe.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4adf1b75---xefedabo.pdfIn PDF document text
    • http://ccadl.com/files/20210809102819.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/49309957674.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lugijuxuzadisebuv.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lv2m9rdu3dme5emql839g0gvus/sotusunav.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05c2e58850---33468019857.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/geseti.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bfec1f6110ea25c5a4d5672de756b7d7/50041918188.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b02ef93125f---mokemor.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd284e96569---25060141422.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tfh8uqam9ah1bh540u0naj2a30/pesoparasup.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/bukafesolevokus.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/61835416065.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ebc068745e28d786fabfb1f833def84e/14092601809.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/281cebc6b760e69e378ff4fe513f5f34/37636075515.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160750b72867c4---75731820000.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613b4307dc---24182543765.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/desukexezozefas.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528191223.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087d667cacf1---wisarit.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01c942173---48905288669.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/791fc6a6626c21b2b6568ce025f8179e/67942080617.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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 16740 bytes
SHA-256: f91ad9ec17f34906086b079482701c47926a5577f2c9306af6d147f2bc0a87d0
font_01_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 11224 bytes
SHA-256: 2289a5a3373582faa53470319a1d960520b1c2fe2bd9ac446033572991b8ba42
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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