Malicious PDF — malware analysis report

Static analysis result for SHA-256 e522a251942ebc7b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 17:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d170294dc92fc77e45421f1654f8d396 SHA-1: a9245810f251d3cf78fafb8bcd3d22161280cf04 SHA-256: e522a251942ebc7b16364c5ade46e2638e5f9b4867bf40673a89b73530a0ce11
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kuhomania.ru/ckfinder/userfiles/files/gabomokepuzegipojeloxi.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/wedaximarit.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100f5ba40616---pinanoxiros.pdfIn PDF document text
    • http://labotinnghia.com/img/files/2989855180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d9084351---59827863104.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ba03902bd28fceee433155265cbaa6bc/vobotobopebo.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/47992822906.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/14486120311.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/48531725883.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8bpq4qlri0uqjfoqg1887fmi61/35046566569.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/jaximurax.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/wukodejexebaxuv.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/duzubuz.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/24570491759.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05e5c0241---zekefesovawizopariwog.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6df535594---koruwimikeliz.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/rexuvaxiroxepesuziruj.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/kuronogexukaz.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/31700334074.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wakatofusidesut.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5f85d87b---pakogejiladudakujubol.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b223d54e---4030761198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=food+preservation+by+low+and+high+temperature+pdfPDF 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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 17748 bytes
SHA-256: be99d70e54cf8c99188e26ff9b76ff01e871f7230a36149f873852395f4bef97
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 11428 bytes
SHA-256: 4489d208f880b3e48df1a4c30fc77bc43772ad2a957b1cc09067a22fe94f7b96
font_02_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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