Malicious PDF — malware analysis report

Static analysis result for SHA-256 612a7736bbbee0f8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 18:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d904866b1f595e67360452baa3eab73 SHA-1: 26ee685b98ea5ac11a9b63eb4b37273c7e2772c3 SHA-256: 612a7736bbbee0f829773d7a28e1b1015b1488b59566f28058997f1c3abe3386
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hardlineconstruct.ro/app/webroot/files/userfiles/files/88984429222.pdf In PDF document text
    • https://medsplus.us/admin/images/file/jikewatozefun.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/48553966881.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/gozuvejifipumutujulizozo.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/rapufokedunesiw.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/96254880921.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095c639488ee---noxakabonaxejuvixazigaf.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/95053264386.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0cb6q41l9c124mcoeg4rkaioc0/2715452588.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5283c79c0---vuxavuzisidotufeva.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e9rn6o9ajiqbp319qetkn4saiv/26586626019.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed503559a19---66418338647.pdfIn PDF document text
    • https://sitarasign.ir/data/file/98969915959.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/limizomudu.pdfIn PDF document text
    • http://cissi.it/userfiles/files/mobubesuwixe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071994caee86---memor.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eaad367135e5bff6e2be1b84f421c41e/kewusuxoz.pdfIn PDF document text
    • http://azizolace.cz/images/file/95488031096.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fbgl73ubjejlrv016c24jfst61/23149939038.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/pikuzabedaz.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e19ec99ed9212baeded051dd281d0275/21455037419.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bdc937a8dd6c2c9a294c6e27680aa892/51717603150.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/wuzos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=richard+clayderman+songs+pdfPDF link annotation
    • 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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 19044 bytes
SHA-256: afd5fca6597d153e3332b19410a31a2995478e7261ef28336d6ab18463430a7a
font_02_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 11128 bytes
SHA-256: 3f9197dbfdedad1d3e1bdd480748709be4467aefe918f7b8fb0a489acb0ed99e