Malicious PDF — malware analysis report

Static analysis result for SHA-256 292900338fc38084…

MALICIOUS

PDF

92.0 KB Created: 2021-09-16 16:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ff43243fa2a8eb65a84b14cad98a95e SHA-1: 1ee302e011f40b8a1c0ac395bb78b36167e8a938 SHA-256: 292900338fc38084ac2f1debad1bdd10d3d9f56d99fc56bb9e97242a69b4435d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://humanitool.ru/userfiles/file/64864624708.pdf In PDF document text
    • http://samajsutra.com/userfiles/files/rifajove.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/jibasalogofewawonesekun.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/37305064852.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d555af62506445b31bf319f01cc69e30/xixufi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88db867fa---somalodofasimanuzoloxar.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/33917378831.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c764003266---fiwuzurudew.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/sakobadujonaxo.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/44075795618.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/25934836018.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/texokisebomozanuj.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/rasusenetogug.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/tejulemo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfa8a1dad7---bezubigapitos.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/30569416381.pdfIn PDF document text
    • http://csc0871.com/userfiles/file/20210916182930_cc9h83.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nekunojobanofunobemuv.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139536b5422a---23178526629.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/331e25bd9b14a3f2680927134364c7eb/pesodowafatasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rondo+icon+packPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10100 bytes
SHA-256: 797dbb61cdb062d22b07a9185a969c419e175d3cca2afd20758d611b9bb5d887
font_01_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 19076 bytes
SHA-256: 72f530ced236990f47a47b049e0a7ef1cd04b2c8754306a1e5dcb05547f937b9
font_02_sfnt_off00014ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1