Malicious PDF — malware analysis report

Static analysis result for SHA-256 b077e9488e5c3e4b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 13:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 55934f684a52f6f6c65bcfd92be25019 SHA-1: 2eafce3543706f16a29b75d89a3b15612553f389 SHA-256: b077e9488e5c3e4b7a1ba93e416b551cc7d23964c6152986e478751c7d6fcc3f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. One URL, https://allytemp.ru/uplcv?utm_term=roblox+apk+unlimited+robux+latest+version, appears to be a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=roblox+apk+unlimited+robux+latest+version PDF link annotation
    • http://norilskgu.ru/userfiles/file/1130917562.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/44871872223.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8941e61dd3---4332390900.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/07e22ba30abaa044a73aa4a9d3c3ada1/82775089982.pdfIn PDF document text
    • http://chayka-svg.ru/files/37843389998.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/89664274731.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sepuvuxu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5a83b1aa---33573701022.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074423c5133e---nexenuwe.pdfIn PDF document text
    • http://toonesk.com/upload/29918216142.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174eb348c5---9312568466.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21902577372.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160820cade29cf---xowonizepiwamajefuzimoso.pdfIn PDF document text
    • http://sun-tes.ru/files/file/68359732671.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gisosow.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a72dc58db8c---74441201238.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a497485ddc---69864020210.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/944pnj0lbhalsvmg6ac24pc98f/50326283762.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c2cbf532c1c476d90fea4de77711bad8/nalofedojizamuwutenituk.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094157ac349b---17279858512.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/16421089017.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/65973521198.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e0151ecf0dfa152b3375282fb19e0762/52415437950.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a37630a5---dekejufogevivatu.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_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 17524 bytes
SHA-256: bbde9f6500ee5f2251ddc8a9cebe59a720ee10e259fe46be8d330a79ab750bbf
font_02_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 11100 bytes
SHA-256: 21c9a45dbf2e0110d28a81b330cd3bcd45dd5598ad64132ae2d20401118f9e54