Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fcdb2ed8e14a7a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 04:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84d0b2232d150db56d01d821e00b8cbc SHA-1: 212e23272053b374de00105dd5067ad14b20f3b5 SHA-256: 21fcdb2ed8e14a7ac19af0685268b3664bac68f3207288f8701f477c1b25487a
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 or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=arch+linux+raspberry PDF link annotation
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/67731680887.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/gulojenusibokenopen.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xuvomidonefogovututenewu.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/21970007152.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/22960550730.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/gujomevipobapifozukaxe.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/rozakebitajoduxodegulebam.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/89073287717.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/vegusidobalijujeli.pdfIn PDF document text
    • http://podarox.ru/public/files/95921228076.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/6427552188.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/31820353646.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/3626065602.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/pobamimibamovovumefudo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f74651a9---sonujen.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/49841318158.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/865828685742585ad3d9b5fab7365a06/fewunoxifekinefot.pdfIn PDF document text
    • https://blugarden.eu/file/didabunebuxagadotevepomuz.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/92052753294.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/46500858415.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d22b5437---79864579374.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/51743050563.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/zusijamitapawomorun.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/44366304633.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/vosavurebitidinapebadafed.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_off0000c211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 10688 bytes
SHA-256: 74fb0f262e70c37f100273f12ac99717f2098e97b45fe5b8206ab4be8b30338f
font_02_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16864 bytes
SHA-256: 838414292fe5f5778b84c470547a7bcfcaa2b2d08d9000d93056557e2fa1e40c

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