Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b916692d0b02551…

MALICIOUS

PDF

84.6 KB Created: 2021-07-07 21:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f9b43ed350107b7107dc9784b2a9fd8d SHA-1: f8f193b858f46d339453c29f5638ec749dafbce4 SHA-256: 0b916692d0b02551ce483c52cbc7ea411f300c90f9c7d7da0fdff8d5a1ee2328
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. The embedded URLs suggest a phishing or SEO poisoning campaign, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=cost+volume+profit+analysis+exam+questions+and+answers PDF link annotation
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd53c96c---92008042001.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/56809593633.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b278fd9108---48747079594.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/vidubigamajafegovuxes.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/63325022902.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e631aef4d---98853968595.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33917782233.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/35044915175.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580a6dcf7c---698736885.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/giwotebuwudapik.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3f159dc3e0529c6a52c48bb176a37fbf/bolow.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/10791439827.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609469ec92ff5---84924829367.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/934c190b8584b7179acce17288cc7797/zejanaxudomemujotu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608493976ba59---77205314804.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/xukonemuta.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/durizogubitepemadudaxun.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/bejefodetaxifoji.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde5d652b4---29333995406.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12cfde904---82361096401.pdfIn PDF document text
    • https://bloomeng.com/uploads/36350963564.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/11146589300.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/kadoxokimovapexetawa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7915d511---47020488643.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ec99314c8d52acfa2ad086098f358e53/12153172856.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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 17908 bytes
SHA-256: ce7dbe23cc0121580587488f68ca75e751bff9e96fdd34ac86c0ce3c367d4b6a
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 11304 bytes
SHA-256: 18afb15256732757b3934977f21a3921de0b507e3568e379bbf39c4799dbf42d