Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fc3963170d637c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 02:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe073c25a9796b3a2b56e8f0ff485457 SHA-1: 9407ffccd89ccdb70d06d8f80f5cf092089fb69c SHA-256: 52fc3963170d637c94c95315d6de474c676a4ef15027865f0b587059e5883901
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the overall structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=ancient+athens+entertainment PDF link annotation
    • http://www.hgekc.com/media/userfiles/file/89316546821.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/fawinus.pdfIn PDF document text
    • http://suaups.net/userfiles/file/zosevap.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd10c0399061c38f0361b2a88726f381/51696781230.pdfIn PDF document text
    • https://peterdegendt.be/file/lukejaziloral.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/wenis.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/ledeburovunatagawobi.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kojogaped.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/80412132328.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cbfcee51fd7fbb5efdb70513e31ad4df/vexozebefa.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/papemepuz.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gagomigubilarewazebeko.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/53342959216.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35c231eb2---wuruxoniwuwolev.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/91145171377.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/56371255383.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/34679032449.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4899da662---84628029558.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432b07692c8---losekoj.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/58009246787.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/52682515164.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10308 bytes
SHA-256: 4edb4ca1bc81b9eeed959be25d7f59e325386bb7814eff221154ddfc224a93db
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 17680 bytes
SHA-256: bb8afdb80731d568b5a14b84f288af47719c9f2282fe8813b0354a8e3324c3cb
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1