Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff8e3b87dced7c0…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 07:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c3453ac29f253ee359bd94ddf604665 SHA-1: 76b26c73230f9e93682d96735218cbd4e3844847 SHA-256: 1ff8e3b87dced7c062182b93acd23e4547ec4e2a9a029a03391db9e31c11027b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=mobdro+not+working+on+firestick+2020 PDF link annotation
    • http://szentistvanpatika.hu/upload/file/pajixikugefejo.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/litovapulaxevijatibig.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/898e8761b21a636fd95c29c7c9b02824/vilonovetijo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/werufusenozibugamon.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210613071221.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/778991144f5efcdf22676a6a6d05ae3c/19662189886.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/71542770555.pdfIn PDF document text
    • https://samowar.me/userfiles/files/fewawopujiwijinufapi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19c670ae0c---75088708781.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/91959896368.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160866f13c0c56---nuzavuvijabadi.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/birodemerora.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/wezimolodowufixonewuzofoj.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qar20sqfht8j7labp96pf7ce8b/86400910679.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/79571343962.pdfIn PDF document text
    • https://orangerun.re/photo/files/tamekeragox.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb697540f2a---pefesoxitukimaf.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/51947177827.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210625_F9BA4038C73BE63D.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8rff1p1ehruqr5e3ch7ffc4sfr/76071280006.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/tadutezopasafonap.pdfIn PDF document text
    • http://adria-ex.com/vinexeluwimuw.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/75243425987.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_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10996 bytes
SHA-256: 51b5155c5ab1d3a70dac64948bb356b99c99c59b98562b9aa2db027eb096eb90
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 16960 bytes
SHA-256: 6d10c76c013b96367d7cc349c91bf635aab3e17974ea06f92befbbdd2401060c

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