Malicious PDF — malware analysis report

Static analysis result for SHA-256 b829282038cafe4e…

MALICIOUS

PDF

84.5 KB Created: 2021-08-20 23:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9735885d19f614e3e963cbb5a1062f9 SHA-1: a52ad90d841d5e94656452a7522a6bad3fbc8237 SHA-256: b829282038cafe4ef17eb475c8b314b978e5e00ad6c9e9a3aaf39fbc551f3ea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=are+button+mushrooms+good+for+dogs PDF link annotation
    • https://n-vv.dk/userfiles/file/befojukusi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7bb120rrcvg26kkuhcho8o7832/goxutekitonegafog.pdfIn PDF document text
    • http://scriptonica.ru/files/files/92610300849.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/37740852738.pdfIn PDF document text
    • http://velisend.ru/photos/file/sabatipalirotok.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77350f69f---17425579904.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b48852f02---fipibure.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/guxijivigaluvaj.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/gonavilibemitoz.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/dumezamowebafan.pdfIn PDF document text
    • http://asfalon.com/__files/file/58426733015.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/61666373321.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/zimokifid.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sukavuja.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/rafutuvagomosivul.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28be6c4208---rarid.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9acf4b71cba4628805efdc2188fab357/mewotoxosusolunutorun.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/31451080307.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6191320c9e---8697513972.pdfIn PDF document text
    • https://epiphanych.com/images/file/zujetabesijake.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/64238822589.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jorokotakupilo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/og15ot7b61fji72uujfsuuc007/92357205432.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45e6696978a0b459e217ab7ef3075053/83010112253.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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 10724 bytes
SHA-256: ff32fb02ed63b69311dfd7cec1f27afd46db9ae61312237105a3d3fdada735d8
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 16740 bytes
SHA-256: 42fe57470f671eac64bbb5490c0773067ec274149ab73612ea3b3f2b238ad0e2

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