Malicious PDF — malware analysis report

Static analysis result for SHA-256 21faebc246949f40…

MALICIOUS

PDF

97.1 KB Created: 2021-09-06 05:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f2ce29b5c04053e815265e55801ad05 SHA-1: b085c391dbdfec510664aea0564261586c2523d4 SHA-256: 21faebc246949f408688798d11fbd90367a63a4255d7cdb1dcceddd8900229ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm, potentially to bypass security measures or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=buick+verano+turbo+manual PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/xofejavijodololepori.pdfIn PDF document text
    • http://pb-book.com/user_file/file/lugoriguravimadinepu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0r2ehfspulea0l8ouvah0tcabk/26236703279.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/72b40ed97a4bb0f29d207a929aebf627/lodatomokowupadifewejoniz.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/kojofajaxodu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c9c862018---polivesurexiwiro.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/87704069746.pdfIn PDF document text
    • http://asustainable.com/global/file/31297128805.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/96875564100.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa76f448ab---lomijofiraginidilavove.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8dfdee5874c325ddd718b5fc37ec0193/pewurat.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/zimurabil.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/lepipibolalefedufu.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/wesosawoboxaniwe.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/96434301888.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/luguvasitorunipuwakur.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/gupizusulifol.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c782eef698---vafejerepifepupabulu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a23a809749c129528cd80809552c9b94/68860610145.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/12085387004.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qo0j5u5n8hh8k6obuna2kvdjtd/fedoxodalusewezaj.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/sunit.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_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 10672 bytes
SHA-256: b0d5a085ee9b2952f6ae6315e72ac8c9c7893bbd7694010c743bc50598612e24
font_01_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 18948 bytes
SHA-256: 92e372829c8f42c55658a96e65f95eba055db70a83c9812093c323a85065c3cc
font_02_sfnt_off00015d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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