Malicious PDF — malware analysis report

Static analysis result for SHA-256 f597d680ac22450a…

MALICIOUS

PDF

91.9 KB Created: 2021-08-09 12:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ff242ff343c214b9b35cac937e9191d5 SHA-1: 9640e683cec82d285997beca64cd0041eeda04e3 SHA-256: f597d680ac22450a028961760b5e66d72abb01bb573a4c58e38a87053a5c0d96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://bigredclassof1960.com/clients/879476/File/31327812346.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d543515---zitokelaxisizusexinuw.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/92209440588.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/kadukubekobu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0597ce15732031544304589578aeb257/95611495963.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/vikasebuwe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b3bde8a01a8ac85e2667332814090b5c/kegetezewanofudose.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/35584779268.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60203e11e---wavibefumob.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/81063178579.pdfIn PDF document text
    • http://schokobrunnen.com/idata/jokozupovepulijorosevis.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/255fdd33dd081becfbaf9bce28060cb2/89691777285.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e48b78cff4f13d7ba79bf0bb8a6ee657/70588390842.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/mofosuxapezow.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/51694321434.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/37578631075.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4adaf73ecc---40721934693.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/xigepikitifuter.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110bcc069502---gutopinaz.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/09c918408d38680332fd5a9dfcec1645/89973103594.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/rosuzizibotakod.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zovidefikelimomovuman.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161108fa7050e3---72836875406.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f00e5cde35c909f96761a07b26e2679b/gowatufokexo.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/xogil.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/silanajotizixir.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fa5f3af9f62c8535bf855dcb6d3cabc8/68893616627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ms+word+password+recovery+software+free+downloadPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 17164 bytes
SHA-256: 8ee87756297530fc385563b976453cb9021d88592a67c7f8e7c8dec5e1fe269e
font_01_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 10780 bytes
SHA-256: bfd1427fe96135d174e67137173ab8905fa2d4746137fa6683b7d776b07447a5

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