Malicious PDF — malware analysis report

Static analysis result for SHA-256 064347ae6de13ee9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 20:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43f9d22dda822cabe948c0c8bdbaa9bb SHA-1: 2ce06d30bfd7ba93c1ca03bdeb7d16095abb2cc4 SHA-256: 064347ae6de13ee952cd181eda078930f94e8772abbcbcd1e4f941e6e85e77e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/04e5b85e4a405a571a7fdf093f935669/83497050065.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/kejaramodefixis.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kobigazivexagugatizov.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e38f4c91db1---54100823454.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/36369367898.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/55049142213.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/71973316504.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779429dba47---kigef.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/kezikebuzozez.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/temininata.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160807c190af4c---bebugipobutudoje.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zabijufa.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/xedunedopij.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab84c4550b---13355593585.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160dabf53a93f5---45324215844.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a2c7b161b0986bfd47009339864aa552/jetakekozotut.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/rojetusufituxekanevu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dacae6cb---refofotopidazemeluxil.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/29743965095.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef257e31b---zefulekuzerolibeponigazag.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012a7e5400---leponenulozipetesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jasper+report+pdf+default+fontPDF 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_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 10488 bytes
SHA-256: caf361edbf3c52607c98424cbeab74074d13200af12c0320a10c58394afa3686
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 19956 bytes
SHA-256: e82ac78d94a220c60e4e32940fe53f524aca4d9d89e8d5d8a2e8110bdfa47c11
font_02_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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