Malicious PDF — malware analysis report

Static analysis result for SHA-256 3785b8acc207349e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 331691c13343f22722cd0dc1add8a50e SHA-1: 0bc0c50bc5dc9cda4f984eb9082eaeb4ec3371c7 SHA-256: 3785b8acc207349ef5a19dbb1dd1ff326efd1365c5f151ed969856d2d4c27eb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=convert+jpg+ke+pdf+online+free PDF link annotation
    • http://t-p-fortune.com/userfiles/file/62637273880.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/18365669746.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/37199880091.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9346d7ae94---20894306113.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/18f8371f37c7593b7b3162035ea87c26/15975827088.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/23407217207.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/ribam.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70ff25e1e---tojimiwojubelemuwulo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c98e05633be4d1608d9947f6795ad4bd/xabagonizamuvivuwimoviri.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768618b4926---33608993572.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tumakovovop.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/maxegebu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088de4cccdc5---kulunavobogubap.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/teleperajik.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/228ad769a597ac7d96119197bac07170/90246333158.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/pajivodulazawiwuvego.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/tufamedaxaja.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608678a5833bf---78745175749.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/79506808517.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/1220470209.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/16037810163.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/6874765089.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zifubijunukudevisipebu.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/baratubuw.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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 17144 bytes
SHA-256: c9d731e1f48d6aaebe066f36deef7c5f27416bbc0e4bb7925f1a7096a446c026
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 10660 bytes
SHA-256: b673ca4de40da99d27b13fb97b3ad91f8fcd5de1615910eb0ec89ad0bb9d830c

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