Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a25198fe6b4c9cf…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 22:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69845ef9d8c0e6c2ee3ef2da6c3d2736 SHA-1: 4d4bc057136ab0a908d7924fe66540c4fd93b23e SHA-256: 2a25198fe6b4c9cf9651871d2ad2700fd97c6fd972694af9c0b9ee3c113e391b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=best+anime+drawing+app+for+android PDF link annotation
    • http://hebakotb.net/userfiles/file/ferewirunudusujebe.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/jafawalatuxonepevirase.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b733f220---18718658458.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/56937549881.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136638777468---21468167811.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/nepivato.pdfIn PDF document text
    • http://haki.vn/uploads/files/bemititiv.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/15807548164.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/63186024159.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/96656272150.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ab397900---tulitivup.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109111904243214.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/zuxirivuzuxo.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/68882221007.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/mokozejetoxebodono.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/19176008309.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/tezos.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/gadagoniz.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/buragapefonadipagupokames.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-07/images/files/jorazakisapas.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/2914621090.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/weluwoxebemoduzowimabaruv.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/xisevojirinog.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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 18228 bytes
SHA-256: 8a811cc1d7e5c0a1cf8cc7a2fd92c12012cad06dd699017267adc3a9ab8b1046
font_01_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 10932 bytes
SHA-256: adc2fed17cacb2f889ef22c793528c3599212c9ea170c3e4899e9dbdcd6a460f