Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde2a292c2f752a6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 05:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eff88814aacc1faf24671e50ebb96026 SHA-1: 6c679c1e34a992746fe81c8439cb8285bb10cdcf SHA-256: fde2a292c2f752a6851d623b503b0a757939fe54b035d1b8533b85cbe2b07eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=android+kopiowanie+kontakt%C3%B3w+z+karty+sim PDF link annotation
    • http://pwmtqatar.net/userfiles/file/zukuxateku.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/federifogavo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eda8c53eb---xonezefapijopawajobi.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/rosubazuturozeviz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/77185851749.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e11135d4a---83675532864.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/vaxigadivanogefevexejeb.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/25811511227.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fasanib.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/2045491105.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lss71dgcadf5eli442r7qqp3i3/revejizasubemerew.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/gumugibijuwaxani.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/pipinawujosivezida.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7432f315---femuzisuranewerowipuragaw.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/79742972405.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd205487b1---fapobajudo.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/mewugesupujax.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/87478504919.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/matuzowiriw.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/wemarabigevimuwamewavup.pdfIn PDF document text
    • https://blv.by/upload/editor/files/54744172349.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/ruganagutajep.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/13350247714.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/952cc7c9a15244219edc56a9a4fa11bb/98526438109.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nogetunipexoreli.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/26813491973.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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 18148 bytes
SHA-256: 1497fc636c7152a0014a16d96741e06aa1aaae3d3e0fe89bd28fd8bf40052900
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 10976 bytes
SHA-256: 419d1f4334a55f11103b36dbd2ddb78aacba81c6f74d551766559cdf6a8d0f27

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