Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b3cfb8166480b2…

MALICIOUS

PDF

86.0 KB Created: 2021-08-24 17:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06bb1d95ed11284af8301e6d8002c3a7 SHA-1: 94f63df415cac31730283a5c5af53c174b78c403 SHA-256: 33b3cfb8166480b2d95eaa20aa106a8be7b094a539dd9c7b433f30073020d3db
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 URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=70+celsius+to+f PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nfv9d5oburcd0gsmqk0ljkj8la/megajamarilomuvogimew.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/92440582401.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2cda90a2bacd3cd975873376217e1c2d/28311861640.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/93298007096.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/50b81b9dedb4a166aa1f12114c7620b5/zeregomakitofikovawu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/78531106644.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17a842cb2---vovawevudiwube.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/61463638987.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3b9b7a30---19872245027.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/vudawibefuvibujekijegemon.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac7e05a82---figefumujifisike.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/13123912369.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/punedemoluzanefewofelez.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/9bca7bd73b57cb4e1d23bc8f61c306ba/64716553118.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/risifulivokufiwudari.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61a0f6bb8d---11090750278.pdfIn PDF document text
    • https://ikima.fr/uploads/file/naxadami.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/zidirasu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/89103499728.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vijez.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3e0860d9399ff75f31a5cdc44bf126f4/mijapewovuzodamodaloba.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f456ccc65d---76250108389.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/wevazosaza.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210801194348_1knnrn.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 17388 bytes
SHA-256: f28c978faf3f0f8fe2c448fbccf5089fc4ea73dc0e0cd4d77459d8cff8cb4341
font_03_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 10136 bytes
SHA-256: 1daa5902f99e6416b0c704d320648db8eefea3987245d5e0d1e6619839bca823

Open this report in the interactive analyzer, or submit your own file for analysis.