Malicious PDF — malware analysis report

Static analysis result for SHA-256 7318c0a720d05465…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 13:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 101e3dbdb48bc88c1e63efcb8c8c589d SHA-1: a7760c6781c70472c89ebf139a6b78e58fe8c1ac SHA-256: 7318c0a720d05465e0f1bcd307f1ccf8607de7901bd7a9e45d67dc60fa46fb47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=m%C3%A9todo+kod%C3%A1ly+solfeo+1+pdf PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6e0d395f---28546609185.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/81ggrk9ogrh2bd9r193gucl72p/49562840946.pdfIn PDF document text
    • http://banquat.com/userfiles/files/95781770053.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/jexujaw.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pomenudukonelepuk.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j1e8vvkhj2mddrh9pilqogo9e7/gudezisevetopi.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/61296011916.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/9876471458.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/245f482f879ae8aa9a0ba58bb95fa80d/25026616459.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/60230413539.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2a75caf8f---42679734027.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nuxezinoboxid.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9de8225694---16275817962.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/toraloxosaxo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f540e54ba25---71658857969.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rokurukovevij.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/74360183936.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/dff93952c1bd3384fad12862c1ff064d/rivivalokewugulogaxa.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/31368318301.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0799cc291b---vulasijegajojuv.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/vozafaripib.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c5ae86e331e88ebc37b717b75c80bd22/66793988931.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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 18696 bytes
SHA-256: baf3b8a1c0bd5ea4a729dd65ff9127506e7fdbc8e7b95b5fc8345fe7f736fd61
font_01_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 10620 bytes
SHA-256: 1a49c386aa9ef2c1bdcb62b1b0a05c994046a0dd98d0948d2550ea5afaa7ffd2

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