Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e85c1f620aad82b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 23:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1935275f31c481dfd1e93b10f29524e7 SHA-1: e5dd6105e26aaf4869545b06ae4411b67dada435 SHA-256: 1e85c1f620aad82b5421a4c08b5c50bcbc4dde5e968cdd0f930f703d995c3070
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cr2tek.com/userfiles/Proj_Name/files/muzajagabitulu.pdf In PDF document text
    • http://fst-uinsu.net/userfiles/files/71340622836.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfd698286---46341380326.pdfIn PDF document text
    • http://hejia-ele.net/upload/50516744542.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376845ab042---19605203576.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/dujajupuzamamivi.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/10703273246.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/lno4s7jldgib7c9duda5vjcn83/widirovujo.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/kilabirujedafodakovu.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/lemupaf.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/60790108830.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/070d3cd72c5575b6bd464a19ca3783be/19749019178.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357c213430b---34455893480.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/94655522572.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/21405564889.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/vomibunixiwepije.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/15621530486.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beaf282244---dawivesexuvuga.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/nipajomazibiwofokajimuf.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/nefujif.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jelasas.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/zamazodaragavinuged.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///82059338125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=small+mb+ppsspp+gamesPDF 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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 17784 bytes
SHA-256: 2bb5dc293b28842ccfdbd4f17bf9fd3128978672ff4ddea5d396787fc2c0738a
font_02_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10296 bytes
SHA-256: 497be828849d72692c83b7d8977f8eebae05dbb37e212959383bfa3a2d5c26fa

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