Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa2df7a1287475e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 02:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5a0134726395b20bd10aeb2734bcbc85 SHA-1: 468358d92b0bd3bf4783ec079087f11c6b9f3308 SHA-256: 0fa2df7a1287475e81bdb5508e5cb1e632276ae6fe547bd856e6333c744721fc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised websites, including those using CMS upload storage. The primary purpose appears to be directing users to external resources, possibly for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://naveenent.com/administrator/imagetemp/file/55766175700.pdf In PDF document text
    • https://superpart.com/files/pusekoxibunepetusim.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/757856444.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130674656c4b---47809612661.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/44137215967.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/29380cd99c8e3cb1efd936d1a1edea98/wanexutediv.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vunuzazelivoxiwaxal.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/66110981222.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50ab4b754ff1ca1283a2891ddb50680d/17100823205.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/xanozuvesagozowutivag.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/tojopelu.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/25977009655.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/kufobedulab.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb0794dab---fupugiv.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/25655755793.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/80731804968.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/kididenesilotukamomego.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/54984721858.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/53053493820.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/79385180738.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/ledib.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/batoz.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/funexotubo.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/ritegivuzem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+8k+video+player+for+androidPDF 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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 17608 bytes
SHA-256: 9166c5e3332355a4a7f901cbbed39463c93ef2eb079705c00a0b7d60fb8ba030
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 11024 bytes
SHA-256: 2f2755158f286a621a4a58b79602c9f787f282527b72edfdb160cf7ff48eed66
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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