Malicious PDF — malware analysis report

Static analysis result for SHA-256 6382f2af47470073…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 08:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e884bd8e5c9204aa7184d8f368983f02 SHA-1: 6f661a975be9129e3feb43ea7183dffe2829c488 SHA-256: 6382f2af47470073e07ab32f173b5edcc2018ee6a391506756b8d06197c1ec95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/38956657048.pdf In PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/3700024337.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/21935868076.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a84gep690bvmi714uis8fhil5t/27216896691.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/715d8a70161e9ed94173b1eadb5351b7/fipevifavibuvagixet.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077989238bff---tovapilaz.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f08c558cf01854889260a1adc2461492/sobuboxixetituvezelusino.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9dc475f8b---xusude.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jojovir.pdfIn PDF document text
    • http://drironcat.com/images/file/35606531654.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/baketigewofuziregeki.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/pujevok.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/mafamewakenifom.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/b5efa9eea38d479901b85d6f98d73034/74569901182.pdfIn PDF document text
    • https://cncunse.com/d/files/12970047376.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/52m3bkj9a1qsvdts2i47eeuss2/57143953633.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/268t7uu8a9p6h96ie4n2ied4l3/babosuvuto.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dg6f23n7ojqqv001jgbn35nrb7/75457716862.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210902102554.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bfda904c1993a49396009afb17ddce5c/74003599530.pdfIn PDF document text
    • https://koratspring.com/upload/file/77606497883.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/tejodefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=movies+chinese+in+khmerPDF 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_off0000ba1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1F 10340 bytes
SHA-256: 625996363185b669a1fdd72307b9a6e97a236020bf7ddf4841e072f68181b1a7
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 17348 bytes
SHA-256: cf54473c33327eb4232dab459b03a3b89f69f411de9be268c195098b38b5ef5d
font_02_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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