Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0475874827f8ceb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 10:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 407491c1d8002f71a0577a379df6d299 SHA-1: 869c087150587df34550e3e5e5f2849c3fd75f80 SHA-256: a0475874827f8ceb4fcd330f10081e777c28870bb2ebb1f6cbf64df53c7d3c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/11697e318b6b0dbce02c9248236f10f8/zutunuxovuweput.pdf In PDF document text
    • http://viviapalermo.com/userfiles/files/25511602749.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaaa71d9c---98617982304.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/xukugakapabifijufa.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kekobizu.pdfIn PDF document text
    • http://muszempilla.com/files/file/rumam.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3da9232630efefc54e190b3caecdc4bf/zepuzazasinipax.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/rifatuborexigopovujuzi.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/8486147601.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/witafijupuxivuj.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/be23bbf1ababa6e400f9c3d1024492c7/mekajeborudonusiwumevexa.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/90123590966.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/54457198889.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kabalipap.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/59291809067.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/likusipujixega.pdfIn PDF document text
    • https://x-software.cz/data/file/7205567472.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/003e3039e878a8108c79c26c49ec1a7b/jomibipizatomareb.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b6ffb1b33f2a58d11a25daad8178463b/liwusaduwivubufuxakalufad.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27872574679.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6f18ca25---63299898275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+extract+pdf+pages+with+bookmarksPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 11328 bytes
SHA-256: dc209374c9cf3e3eb4b6188a27855ce32009b4a4daf0537caa0436b4705efbda
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 17496 bytes
SHA-256: 84508b8758307821559687d06a89d1bb7369c3d4329fa325ab974aa4d0e8a6c5

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