Malicious PDF — malware analysis report

Static analysis result for SHA-256 332461d8e11010eb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80505474b593f369ae6711d319f88e7f SHA-1: 4d259ea0125fe9a7d5ceec74e87fedabc20bfb0e SHA-256: 332461d8e11010eb14dcc08eb26eee7e88cd2c88c1141b070ebb358c3cb2b993
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it exploits PDF vulnerabilities to facilitate initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://shoppingplanet.ro/ckfinder/userfiles/files/93018859739.pdf In PDF document text
    • http://atdawnwelift.com/userfiles/file/fexepefusi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/50935081409.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/89118256270.pdfIn PDF document text
    • https://majubesar.org/contents//files/76295940978.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/venaserilozifasepog.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/dafodujajetisu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/3979056618.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/narijesotaforozu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16126e75f75e16---58632819732.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/nozezasepupab.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/16632172818.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc74bb20f8---jujefipid.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/firewaxol.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/90911008970.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9a8158veju3601lel9gmadck75/19616860478.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/27651546518.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nagemo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76bf7d191---sawenagetafoserizitajazug.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210630000659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=supine+medical+termPDF 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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 17684 bytes
SHA-256: 9019b9c21d8b139428d0e17c0a47a11cbfedbd6133bafa525776e30e0fae4738
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10560 bytes
SHA-256: 4e8fcd7bc210108794f742b9892eb4be4dbb49d492b41dcdfebb76d0a89111a8
font_02_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1