Malicious PDF — malware analysis report

Static analysis result for SHA-256 859670094aa1d63d…

MALICIOUS

PDF

94.5 KB Created: 2021-09-21 08:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b3bae159a81625c1ce7372af6f728a6 SHA-1: db3fcee4d95c3dfc556d4739ad47a0945bebc7dc SHA-256: 859670094aa1d63da8eab0f2abe7236d9438c86c274d5dc2486258329555015b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=watch+friends+reunion+online+free PDF link annotation
    • http://radecznica.pl/userfiles/file/56554480333.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xomonamuzulironu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/62438198900.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372e8fbcc---66656870339.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147296bb6f26---nufujeji.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f66a2589---fatila.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/zewavaxigovivisuwuw.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/83556830014.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/fumav.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfefb65b54---22499954216.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/966f52392f1288462a5d2a876e8c5f71/wopedavomifegojivofu.pdfIn PDF document text
    • https://kratky.eu/files/file/96589643256.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fuzoranamorebabe.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/vukevizirasarotasepikini.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/64604649160.pdfIn PDF document text
    • https://network-italia.com/file/menupoleregozusajaxesepa.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109161456522766.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9731417c0b1022e044ed87a3ce0f4e32/33920116213.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/787888377.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109131428013918.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa548f1e44---vunotefizaku.pdfIn PDF document text
    • http://tochalco.com/uploads/files/53879683837.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/zodebidunogobibupu.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_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 10664 bytes
SHA-256: ebf41ea1ad1030a81d60dbc8dc0b0e293ad573e8a4cc2663bdcea89d37e6fbb9
font_01_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 18456 bytes
SHA-256: 5de7bdc276ac0f314f0345fe055a890cce1f10d725c7c1ae3c6de8255103468c
font_02_sfnt_off00015476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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