Malicious PDF — malware analysis report

Static analysis result for SHA-256 c309c68eb9c45abc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 10:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa665ee95de4bf80fe3d113aa3485d8c SHA-1: 24e317e3b3aed1c9ae5c48d8137c427ea20b2b63 SHA-256: c309c68eb9c45abcb1ce7891ae33b0fd71912f0bb114e90fb3161f1994ae2697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves directing users to potentially malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1d355u7idtng9v9quelt1d0p93/pamaperali.pdf In PDF document text
    • http://abwferrellpkwy.com/uploads/files/bepulam.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/peroxotatisasekejoj.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/41658505390.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/29745537866.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/59bcf40c99e01e5993edf8fb73eb9288/jenirujojiz.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/sifajomil.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/gavaxuvuxivufinidejiruzik.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/88747485346.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jerojukilusagef.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/28613482705.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/31377036574.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c298a5abe5---22536122764.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/5964981400.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zitujipoxukotovedigubes.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ceacf3f72---14466786010.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/puguki.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c67a87e58517ceadc5287a3a2824df8f/49028572662.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/gujatoduxevosazusale.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e1dc33d8---vebufamolebatined.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/ketubirakiwinidonobidas.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/491256558465fca371181bf798b11a3d/ramudegovigen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+de+tuberculose+2019PDF 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_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 19280 bytes
SHA-256: 5af9e533b491848b2ced2ab425d143fe5b54a266ee5f9c2e9cbd4523b645f3be
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 10964 bytes
SHA-256: d80b1c07304965449750aba6f0ff953faecf9a4a231f4c6e39375f091e6b65a1

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