Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6aa284286bbec2…

MALICIOUS

PDF

96.3 KB Created: 2021-07-06 10:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6bc2648e941a0d15aa8b8132369f7d54 SHA-1: 8c965c6e176cc1bc7be9cf3f850b6c4a7e7ec7d1 SHA-256: 5f6aa284286bbec28d369eae2ba4ab56647f6f660cf8279207fd5a9df90968f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malware or redirect to phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=general+question+and+answers+for+quiz PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/78d7bb9273dad191cf58392beb07ef92/794391102.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/piparorev.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vukiwuwotubitomitewipus.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/74710020457.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ee820c9b4---90873374172.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/wutuza.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/81611148399.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/34464123051.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/tivetoberasobupozebedi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b682c774---gofavod.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e05a833c---63990403939.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b907b8869---55833353346.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a616e4b5b---vekizerusetavuwidukodire.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/01maurta6ivisfg575k3ihl2n0/34965695181.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80096ce227---95374578887.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aafb51d17---kuzajid.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff791056a---4305528222.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b436e826---mefawurekaxagejazemop.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9o1tk246agi21dodfri8nhiah4/70210128845.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/gapevafefebojexezizujod.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d84c22d3b6c10649cf28ffb5bff29162/kajiv.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/47818350109.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/52847057493.pdfIn PDF document text
    • http://rubensova16.cz/files/file/77115659475.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527163357.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083727f2f8c8---jutekasopozokak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 17540 bytes
SHA-256: a06474068b8392d12f60b23a1267ecd5dc0f98660d3aa8a93b754518648013ed
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A42 10780 bytes
SHA-256: a883f4e7eb4a607eeb777a2b7a4a26c54a9f61de229d81b17f165c65c46cead8

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