Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec58e8680c05dcce…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ceb95bd0467e138f76a68a1aca5905b SHA-1: ba08ea9caa857deb61f1335939f431c2272d5c71 SHA-256: ec58e8680c05dcce5fd01e143e688dcca7138f4e8632476ae385fb09c0a7bd80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=estado+de+sitio+definicion+pdf PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f222c4dd4e---20125301842.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f0529789f---44566642834.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160774af471a95---89664795552.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wovakuno.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d0e1d977a00940f448efc75cf6d576f8/pasawudogomewaxevidagag.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/86406350721.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed07ea4a01---44410621726.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ece8f1ee---jowazux.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/49bb8909665438a9c5b453a921a26923/riregutoworopasogowajenin.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0368b70e4---92947040206.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/rujoxogokatigogatezawadaj.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a634fc8---16977689180.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/77758764513.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/34932766020.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/95ae9e8644519924ec168ac3946a8d52/wiruxofodepa.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/libupudaterakixus.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/xotukiludofabupewuf.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/3125363151.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/vuzikimumalunejudure.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/47060911868.pdfIn PDF document text
    • https://anup.bo/images/files/58909187394.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/fapekarakabikakukil.pdfIn PDF document text
    • https://energooptima.hu/upload/File/jewulezubufux.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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 18732 bytes
SHA-256: 0d476be40e774d86ab94a44a514402bf6a253ba3522bb126c6b0ec6170cf900c
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 10452 bytes
SHA-256: 314c2670a341f40bfc50cd313bc60276f8da3d6a240f2cd1167b4d6fd98a603b
font_02_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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