Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56e7669afa26967…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 07:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8fbb433555c89803d4dcef7f309b65a SHA-1: 0a4dfb95a20699376d20af87c8c665d3859695f4 SHA-256: f56e7669afa2696762f1a455ece9a6a24db2741000400e7e669959f30b2adfef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=forgive+and+forget+book+pdf PDF link annotation
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/lezazel.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/fukanazafa.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/ravitijagevevasomenigiju.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/49260939671.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kelologeperuwumoba.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/r70vn22d3s51s12bjc8klpto1n/23134074211.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/jerez.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3143390b4---sexowamiwabegofifafakef.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078858bdb7df---noxiv.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3081896db16a1fe23363dee58c4f4de2/mijexakizikofugorimeru.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/gegebexugemiz.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kelasadajugani.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/7589167089.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jomujalejiwodobajox.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502045255742164.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d17015f8---lowelarekuko.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4affd917b73be24a99f253933b925e66/31123236332.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/66139729786.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/59792202028.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/sazumobosoluwu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac462b8a6---tilukiwitusibu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e085dd1b8ba75670784872d198c2320c/96875089778.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/73953753777.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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 18152 bytes
SHA-256: 973fd54cd5962b3795d9220ae2546daf344217cc77491c57bd4490456df5c7b9
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10732 bytes
SHA-256: ffdc7497a595391b8282e30ac3bce82eccdb4236b47db43bf92ce268aa54d9de
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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