Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ba3d5c311c32dc…

MALICIOUS

PDF

92.6 KB Created: 2021-08-07 07:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86251aca135279286d07c9568a8705c2 SHA-1: 95326bc32752eddee2fb06b144032c85674b5636 SHA-256: 20ba3d5c311c32dcc26453a5741718cccbb605067f4cc0ccb3071d08b5479c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://fioredda.com/userfiles/files/vamasomivojovekotiboto.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082beefb95c7---punuzom.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/41995130537.pdfIn PDF document text
    • https://p87.hu/files/vorezumokedatixovexejoz.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/10417651207.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46857d3ef96bbd13b9790f3267317121/sokowuderovigufifi.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/navupomovus.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nuzinule.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/bulawasizaga.pdfIn PDF document text
    • https://digireg.es/upload/65319334167.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/talowozifoba.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16099f12394acd---badovotaxixedexurijobeme.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/laliwexolimozasukowom.pdfIn PDF document text
    • http://goref.ru/files/file/17350034476.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/juvirazevakiso.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/zejaxuwenolufetirutolun.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70a6bdddb---28026701775.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160977a0c71fab---68641821257.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2a1837031c3cb6875f4228e3a0a91366/41174581776.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/migigedemibupa.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/57932701875.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/28033904204.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8e7588c2214e91324e96692905eb4e06/xowigipo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc1ce5b75---resajubunen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+episode+does+kakashi+kill+obitoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10508 bytes
SHA-256: dca14b507c8bf57123979958f11ab75ef7f93e79a555840ac79daa073ef42915
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 17276 bytes
SHA-256: 67f3789b7e2226bc0a8d69320dd03296d756769021de0c7b1391a080fcc552d6
font_03_sfnt_off000155bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BF 3540 bytes
SHA-256: 89a5307e37c06b0b43ec98732acddaed70e9ccaed31f8248eeff05975e01e5b0

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