Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd5966a74876da9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 05:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 058acdd7a629b33d541a7bf0d99c02cf SHA-1: a641f11c1c7aa9aa5d4e6b381bfb39918f63abb9 SHA-256: 4fd5966a74876da9237a88f8790be92474a61d0061d5a4e29646e198412ebbe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall detection indicate the PDF is likely used to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=status+bar+dating+app+notification+icons+android PDF link annotation
    • http://tomaszskiba.com/userfiles/file/55749230445.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/90587080596.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf46355724---genakob.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/dimaruvelamepilubenapaf.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fdd7825d---kejazokuvejuzifebaleziju.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/62461332275.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nasosidigawuvapuzexujeg.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/86123498452.pdfIn PDF document text
    • http://ucokampen.com/media/files/54051329963.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/fepon.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jitenabavafaraxorem.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xivutuweluzigudigom.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/wawidaxo.pdfIn PDF document text
    • http://rts-3.ru/upload/files/93348930487.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/18d794d4002909c3980469fcd72da18b/gidemipax.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/54173570348.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_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 10932 bytes
SHA-256: dd2e6a7a7167bab815666c5aa83ef0f0c72066cc4e88f9df07a4c8ea0796398c
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16548 bytes
SHA-256: ab7a49aa14f0a094861c85ef606e8a46e24416e8103e61de2040e74458fbcefd

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