Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c558a9b028df3d…

MALICIOUS

PDF

83.1 KB Created: 2021-07-29 14:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b172ae9440be3c7040ea11ed5cdc3c58 SHA-1: 8b8c6b60fa27c80de03355eb098a37317d844623 SHA-256: 38c558a9b028df3d3b74df8f56fd2763e3467ed09a39d63ec6756c894920ca3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The presence of external URI heuristics and link farm indicators confirms the document's role as a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c932ccb4c---tofinu.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0862e7fb---14042018960.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff8de0bfa---19439050011.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/bepubavidenupezakibapopax.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa389a7f002---zetavuguwekadaxuner.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/74404691854.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a64bd59aae132b43429538ca17480e48/xulubivamosuwawagogamej.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/vinejasup.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684a7b6bde---rekigonesukixagexubitil.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9f73f48622eaea0f9253294b1494676e/88908790515.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa36183f2---71502382212.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/29703926270.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65e61e3b8---17900836884.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607650824d59d---zigiwidibuk.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/66392852543.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6de7d6911---61868374901.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/wimawipemoj.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4993850---bigigoladunabavufo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vmgnsh50lsqbirhiapqhh3d93n/81911291127.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/eo87gbgu2q93jhaa9v0jcorgok/38873891223.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/divawomofezelikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=netter%27s+head+and+neck+anatomy+for+dentistry+3rd+edition+pdf+freePDF 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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 17000 bytes
SHA-256: 70960b64188ee00e7b508fb1e8a25173656a3ef3db721f4b46526fd0917092db
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 11228 bytes
SHA-256: ee00d773d8e538d9aa354cd93dbe1cd3134dc56216dfcb14c75d9bf8d04ebbbd

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