Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb152429dca209ea…

MALICIOUS

PDF

87.9 KB Created: 2021-08-25 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86824e21a4967a4062a985706188071b SHA-1: 265e64a46ce1ee5e2f48e9cbc65f24719faf6016 SHA-256: bb152429dca209ea781057a2f92df89c05b524c90e820104df0e7977cf13ec9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to facilitate the download of a second-stage payload. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://aymexco.eu/ckfinder/userfiles/files/disob.pdf In PDF document text
    • https://dm288.rs/slicice/file/lebodofeka.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/76711358598.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811a87b9af---xekolagitapufolanunex.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nelojudoxa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ec344caebbe5ef3e6c9dd9d0500ae107/74850065783.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/tosumedofaleziti.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c6c6a721e7d7fa8c8fb4d348e35ff5f/54180274101.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/jijikep.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/66183368346.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/fatosinawenowiwofezuxifow.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/nexavawusegobagisora.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/32882992398.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/48963727363.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160848941c2433---lupurodotepu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7jt3qpq4vknvljgdh5a9h9va92/20523658376.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/wiximinujaparezesajuvef.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/vofunogugazi.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/vamupifovanedugelefejex.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/wafetuberuruketirovijiwas.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/44329d4ea5f8c0a50f59387c5835382f/zeforetisiropoxenurej.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4d83f241d10d225961898090345b36d6/gikefenuzipawurinap.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/namibiwezuwodasusarixewir.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe5341416---40493178427.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/podazowajomifodaduwad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dungeons+master%27s+guide+5e+pdfPDF 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_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16832 bytes
SHA-256: 86e7f50aadb39554c8ea180cbe168072ada564c3ebf8a6e04e6abea92ea6320c
font_01_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 11064 bytes
SHA-256: f533cf720b6a25fa913d26356bafe76a516c846c8fa3cc125929951a89920ecd
font_02_sfnt_off00013888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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