Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62ab4b95b8f695f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-24 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f32db8f9ac339635587537936c6c07a SHA-1: 36bae22c8c5fbd6c8d7a286d114401d3ab06a9f0 SHA-256: e62ab4b95b8f695fd8380dbb067e4f931ea2bc444ad5fc9f7159048457fe0b02
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thietbixanh.net/uploads/files/14267118927.pdf In PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/goxizixesanovadozid.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161485f60e8d74---8678517631.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c1lrern5eiji1gj9452lqd4v00/jezidasimadabunosufutina.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/10622119491.pdfIn PDF document text
    • http://surestegc.org/documentos/file/28145080400.pdfIn PDF document text
    • http://dkind.net/userData/board/file/56019957021.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f885e9974d3b3dd64ccec9d63f9be081/gasokulefujataz.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/59420935990.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903163122_328819433.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161324d2470287---76221224454.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/40340225634.pdfIn PDF document text
    • http://huiking.cn/uploads/file/110124188553.pdfIn PDF document text
    • http://bndweb.nl/upload/files/45922061872.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/dojuxirugufudunovewuravi.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rubujamamebimepifafotuwuv.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/10331664012.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2d66b0f52225c13052fd8970eae52a1e/1103084445.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/dezexizorarufikopu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fufogeg.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/9668120318.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210924011555.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/nevolodenibolomiralosel.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/jigiratab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dating+mod+apk+2021PDF 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_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10676 bytes
SHA-256: 7d1a4e0c4536d8e3f15406622937febc5f7d43752129fe8d701a7fb06d1cb3de
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 18068 bytes
SHA-256: 40afff90b8f2161e71d0091e8dfe1ed2be9f04232ea30278e358d0b5d6ac88bc
font_02_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1