Malicious PDF — malware analysis report

Static analysis result for SHA-256 584a9420fe5a0a01…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 12:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8103d665d9151acd92558c21f19a35d SHA-1: 9804b7d548e2fa93a60e12104fb59fc7ed09fdf2 SHA-256: 584a9420fe5a0a013b59f875b52024a8bc05c7de8d0c1c0d029c126a50988526
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=best+offline+pirate+games+for+android PDF link annotation
    • https://preprodpcb.com/userfiles/files/zovofomoterulamepe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056b7048d2---sesuzojafenumofopedarole.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vakizepaludemomol.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/257d8de1c51a85224ed98b08fb3309cd/sexadapubedagazi.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/28857340999.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sigilujul.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/63996487757.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jazotisapatizeb.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/6725501384.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zukesapimot.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/20290845379.pdfIn PDF document text
    • http://www.moyekolodin.com/files/2718246788.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/30261502.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/83780466860.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/tivagaparawawufevi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/buvixenulevuzewenixirek.pdfIn PDF document text
    • http://jainfarms.com/uploads/libinomokimotidexuze.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipoberawos.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/65692386710.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xiloxufiganazubomatazu.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/wezibejidero.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/92fuqganj6t8mdskgeeu6824b5/21636588805.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/28955197314.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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10892 bytes
SHA-256: bdde7ba3a7dc85812c0788772e7aa550eadac8044f28c4b769aa138cd463bc56
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16904 bytes
SHA-256: 97a75513d64d7bb843f08b334eb4915a2c35e95aac0b4a3a27329da7a89c385b