Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf162521a043ef01…

MALICIOUS

PDF

76.4 KB Created: 2021-09-22 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1eacaac47f4549802843e48e1f198219 SHA-1: 477eda798227b869c42545436b760487b8cbe8ba SHA-256: cf162521a043ef01e943f707ff12fc6d546420a3640d4fcb5de130f68a6753f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised content management systems. These URLs likely serve as redirects to phishing sites or download locations for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=mi+a2+hard+reset+no+command PDF link annotation
    • https://zibarajabi.com/cache/fck_files/file/64798463386.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/nefofekozezuta.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/lazojagu.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/84641383038.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913011740333294.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140084b1e3ca---80243555827.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/22899679981.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908133848.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/41582862640.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/58373004004.pdfIn PDF document text
    • https://jin-ji.com/upload/files/kavamemufemebununidol.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/34891555465.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/padopukujimede.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1d7cca46---61724873001.pdfIn PDF document text
    • http://shahgrp.com/uploads/pobef.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/xukapo.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gikujagakowexodemufunegag.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911181202198.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/jetukemiwododewapinomedo.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/98057366475.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/16557618978.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210921081742104.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/96680989484.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/06b6c19f43e453dde12155fc12101de0/28872800614.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/kesogujojupok.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf3fc20a0e3c13211fc555f212a73537/35270751132.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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 14588 bytes
SHA-256: 3d0440e090b44d51eb914f7fff5921d0f97592e4bce16213175751592a67d058
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10704 bytes
SHA-256: 2661873c80141ed0d820978fadec8ea6847db7b320069d01a62fd08a6f995e9b

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