Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bfff4b0d7ff7c8…

MALICIOUS

PDF

98.5 KB Created: 2021-09-17 02:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eaea9db7f8db4f1a893ba8500c686daf SHA-1: 34ffdf470b358f7d87453f5d8d0b60d3d6083089 SHA-256: 63bfff4b0d7ff7c8adffa517891479790ca354683d6a8825e45cfaf07ff741a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://archism.ru/uplcv?utm_term=redmi+9+vs+a02s PDF link annotation
    • http://shepardinteriordesign.com/rw/upload/file/kalagenugosivukagupuki.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/33096834930.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12bcaf644---wupepujirex.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ratulubugej.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zuxefaketefar.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/zoxupadigupusato.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/vomiluvelifosebigipowo.pdfIn PDF document text
    • http://synphabase.ch/upload/file/37805680882.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/siteniritinisiderobuvev.pdfIn PDF document text
    • http://sciattella.net/images/file/welenejolup.pdfIn PDF document text
    • http://profstil.az/userfiles/file/32189267036.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/72894816392.pdfIn PDF document text
    • http://metapolar.hu/tmp/6515862401.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fijawavetanofusojufozadu.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/23410178419.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/98f3276719a640ac48b7cc612e4452be/33269003548.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/55830034531.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/80284445352.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16134530b88475---mazobizabanegugeja.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/kawinozoje.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/kafimagulipufiw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c37388b---51985054544.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/25100147525.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/fojopegekedatelitel.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138babc0f540---tipizojowenises.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/nitorozoboxijavap.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/bizuguk.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_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 19568 bytes
SHA-256: 2ed305e21080ebcb556dfd963e0d890531338b49b2f1a0e5ec8d5b4a6a8c24e6
font_01_sfnt_off00014c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001645f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645F 10460 bytes
SHA-256: 1a4fe6130940249c39fea601b1be612e069c38b979b90a575e218afd53e5005d

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