Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd872008eef8587…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 09:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bd779b219f980f7125bc41050587746 SHA-1: 1351a1d9d9e8dea09d27c73fcc0191629a3f58da SHA-256: 0fd872008eef8587f8a0c46ecb18512ff8311666cde8ea086466461cab20a135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=policy+%26+procedures+manual', are designed to lure victims under the guise of legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=policy+%26+procedures+manual PDF link annotation
    • http://forma8.kz/ckfinder/userfiles/files/46349005416.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd036f456---13735630842.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cnscah5208ig1fvvqvb6qpr8f4/ruluminirusitiv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072164dedc48---10757087323.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/18012738965.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8daa7b8c90---47510186825.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r74eo9ns60pj7151hnre12su0/guluwutokeromuropu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/52414228909.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed999a2e7ac---redumezazaxosunomunoralu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d514903088d---22536823200.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2857d57f---munedozozujaxiju.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/46e7ebb57540385fa9f256f5ac39571d/tujekipedorimav.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/mevolosorigiparupoga.pdfIn PDF document text
    • http://capital96.com/userfiles/file/duxijasasadaba.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/60990918036.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb4f5f4e5---78956770286.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/tewenozekemun.pdfIn PDF document text
    • https://orrizon.ru/images/file/gegafax.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dsolm4i0hvinc8mbnfcmcn0gs/93070249498.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ef361a5---61409220617.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/is693ag6qe36rjn6qje3ic5147/81633404578.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/15d0391a1dcdcc09c4631e07ab022baa/99459339042.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/tamugupolojelonojef.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_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 18976 bytes
SHA-256: c8a600d7982340572603aa4e0d688d62202338cadf49d28600980a22c81b71c0
font_01_sfnt_off00013285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9B 9568 bytes
SHA-256: 175ad19e5b2f8654ddccd8c29c7ab6f5191c2b5e1fc559f2144c6e3fd5ff43c0

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