Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b6a5f1ecc06943…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 19:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df756a498021888cb796bc94ab7df26e SHA-1: 60e624295e378d1597808886750a85000a8e1b97 SHA-256: f9b6a5f1ecc06943a4e2d576d525486a4d6f2ff85b048d2bf964fb8e56bdaa78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://huntic.ru/uplcv?utm_term=falling+in+love+too+fast PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084381c203a6---rimonefesifamebunap.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35ec79abb---63070254754.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/38498605838.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac4ed9709---tirofezokafomanawu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2085626375f5026b4f278a3d6f274c80/lomujujowimasuvuv.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tifatake.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb02b777b8---4370978705.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/lamixikubajakomo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/76760466016.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/jonekiridovalegevi.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///66281037382.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nbm5jho1jesi8s466b00ve3p20/77610713833.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/99668442006.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64b08ad79---jiseze.pdfIn PDF document text
    • http://mp-journal.com/media/file/17555503134.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607078f84b2c0---banigutefituluzam.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d8b10e70---39645081642.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dupipejabopesifanamubama.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/pusozi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052519192996.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/60425430074.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f7bd0f47a838141128a71b24af80fc70/28777912679.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/4849179806.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/34bfc8e35a4c750e3eff326dbb0c1464/nesilejesufokan.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vumokodapekidinozevin.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_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10332 bytes
SHA-256: 9aaecc77e549ad9ffe9cb09041054b1d8c0f20c80cc1daaf14eba4dbff784f96
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16972 bytes
SHA-256: a2d0809330f8ef362cdcb9bfd6ce7aed041c7e39a1946cea6b061d9399b421d1

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