Malicious PDF — malware analysis report

Static analysis result for SHA-256 923904005af59dd0…

MALICIOUS

PDF

86.9 KB Created: 2021-08-14 18:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 760d0456146cb8a418aaf64e031f6d59 SHA-1: c83d970d491a9e4404b1be66569bfa7b0e1cefaa SHA-256: 923904005af59dd0e9e86a0701c43e424e58dd64c977ec443af7bbd5511a34f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5ecc2daaf78556386174734c971bda54/27262248458.pdf In PDF document text
    • http://alemotta.com/resources/original/file/kazufelano.pdfIn PDF document text
    • http://carszana.com/image/upload/File/74430243037.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760f0de2bc---zefomonesasogagibinofa.pdfIn PDF document text
    • http://akademibt.com/resimler/files/51301370703.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/zibogizaponapubileja.pdfIn PDF document text
    • http://www.moyekolodin.com/files/toginazitovaneselenasit.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2282d9ff90---89911889040.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160832f86c72ad---62074659758.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/rujuwaguvawodamujajoxu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaef96143---mevopukewavif.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/28jn8tfvjkqg55must1r14dtnd/92497925923.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kesoxogivasem.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16172849c---zekufafutukawupa.pdfIn PDF document text
    • https://songhongresort.com/img/files/10003409448.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0cd1900846937e2285c0ef43ddd2634d/34495288568.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/40112209017.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8l6n5unpu30pcgr5gt92o32jj6/karitavujuzigorenuponeg.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/rirutazaririrode.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/53684646785.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/ginodanuzenopusotezazo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dacbdbd9f---wozobexujidarijikaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+pass+the+general+knowledge+test+cdlPDF 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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10872 bytes
SHA-256: c474d5fc6a162e24191a79a20ebae1cb5cde6d10878592e74c1e70ccd176047f
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 17164 bytes
SHA-256: 87764d8247449346354c09136f5e4e23ebb51fed0d3b218c4230ccee0fbb7302

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