Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3dc24f5d840b9b…

MALICIOUS

PDF

102.3 KB Created: 2021-09-08 03:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 597f066cd53bfc45c13e55dc417a885b SHA-1: 4b1a7781d968384c9500bbc9d5c52cb434bcc209 SHA-256: 6c3dc24f5d840b9b34559fed83b3bbbbb8dacf77b157c26d82a30ac6adc15de9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, likely for phishing or malware distribution. The heuristics indicate the PDF is designed to host numerous links on disposable or compromised hosting, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=disadvantages+of+polymer+concrete+pdf PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8e76a20aaff0f68b1e491c7e25bd1bc6/94513229781.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/30969838224.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/57651584869.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b750e6509f3ee9a3aaae288aeb578b4f/1173411472.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa065cf236---gekipovuk.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/68451311833.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/pugavoxozukaboxaroxizonar.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/53sh7f0akqsjinqjun2qv4p9ns/76851029460.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/71221047041.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd91d49c4c---votetosixaxepenop.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/63167835171.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/44604220566.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/70000734071.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/93409890298.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/88915345390.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/42842824353.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/nanimovidiburemakefup.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/vemilididoxadaxi.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/bazexogukalemomelakeb.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/nujatejabaluwavofexeta.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202108090021029898.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/sunutuzolewuwusas.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6ffc064d---roguze.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/muwalekakidavebapavatitut.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/texufogilovuxir.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_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 11144 bytes
SHA-256: 0de0a227f3105bfd2b04ba7dabd250cfad72a711d5188baa57c4321af52cec6f
font_01_sfnt_off0001420b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 18840 bytes
SHA-256: 2ddc64bd2815498637e8320e6f4ab492f45aa5efe8d0b365ca9f9852a5b26042
font_02_sfnt_off000172f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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