Malicious PDF — malware analysis report

Static analysis result for SHA-256 8237ba39cc7d4b29…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 22:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc2364246ce4c1c28461641b28284161 SHA-1: 183ce8c681185207a3baf65a4ac2805a002fe070 SHA-256: 8237ba39cc7d4b29f1f1d6590a741f6769373ea7704282b043d6dd33a771b854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=mitsuru+kirijo+dancing+moon+night PDF link annotation
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bb4bb0e89341bcafa4c9c8fe22e93ca6/nezuxasanazodujedujofis.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/26093414675.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210910052709.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zigizusajotinojetofuwi.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/74111195227.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/pefiwaripiruwewavodow.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4eed2ebb5---fabajupadevororuwo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/576bed64c8c16a5dcbd7b0adfa7b1aa1/25121817524.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f99a5a9e---90000603761.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/49152887503.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/2418810998.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/79328952615.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/kazozo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bf076da2---46274293502.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/72378889700.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/goguzerekeduv.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/xamedevolidekud.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/zezutisevidifokili.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/23047930080.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ho2hsdehp2oaogncv3i122qd77/94138386498.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/88339976766.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ef38d685---wolerepupoxerovibew.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/19997171502.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 10956 bytes
SHA-256: a3f3e326ea20603e475ce0ada21a128fd28fdd3266aea087f7ec62e642ec8b3d
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16808 bytes
SHA-256: fa63deee0e3fc935634e5dd39239f562d5d4db7c4493b83d3200ac5a7212a6a7
font_02_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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