Malicious PDF — malware analysis report

Static analysis result for SHA-256 7583368ebcef1cb1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 07:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2df3df7bfd293e9f293d2eb692334a84 SHA-1: 037b0db8bfa22f88665d3906fdd9e0f5e81210dd SHA-256: 7583368ebcef1cb1fd93e25a4f5c71c908675ca5abf36e80c4ed64aafccf419e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=watch+us+online+123 PDF link annotation
    • https://www.naabelectric.com/userfiles/files/potamalatev.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/69767920113.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/wudifaf.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/5116368910.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/mufabitaruripig.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9fa2783---64072188134.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/widigonigilel.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62eb2ca3e---suvopubevurebapikamige.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/57368230162.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/64090129029.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/24370939155.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gf9sripje4q4cfaf3gefh04rd1/pubemelan.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b66d2d27b0d98f5721e655dcfc79fd4b/kagujezafi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136772e10788---gojugajorebuxifopel.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/kovovegiwofebutabupim.pdfIn PDF document text
    • http://roocenter.ru/upload/file/mewid.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/48146838777.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/91309829714.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/75524546907.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/xoziparopune.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/44244445324.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/43237251287.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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 18020 bytes
SHA-256: df54b7c4d32a462f6412e93ffe43427ce6ec71490c781285f35c9bb1dda64715
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 10664 bytes
SHA-256: c326f581e9688a8932bbcc77d2bcdebb42cd1631236230f5b8730c46868df367