Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3c46cfd1405f94…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 05:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82b9bd738c991d607ff15774bb4358e8 SHA-1: a3b5f63420466621373e633365c7c205316379ee SHA-256: db3c46cfd1405f9425fda03a5756a7ff2f40ae8e155f92b1a6f47848f1c9f809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://z-i-f.ru/userfiles/file/27645230462.pdf In PDF document text
    • https://realschoolspirit.net/scauserfiles/files/4788099673.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a760138c4ac---73681985503.pdfIn PDF document text
    • http://15881588.com/ckupload/files/fapufakisijovuja.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6426dff05b3b8d13c9d26f67ba9b254d/pesas.pdfIn PDF document text
    • https://atl-50.com/files/file/tokosoxazevekotipuzite.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/81541189192.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f4f27a70c---83348287980.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/tokafam.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ahnmh6vo4em4kpvf6tu063s0fr/bikebefumusejibi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ojovepajenoxodavetomu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/42e39d418efec92d1e82855306ff948a/lexefopaxefamuzigebakubu.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210611003019_t1x8i3.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41509317546.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086f11121cb1---54671404319.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/14455601031.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vulumugopopimimilite.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f0940f806383fd638e2581fab5e6cf44/48518703181.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/subafufowawudedoguzone.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/79808cf1e527d8b764286c0581277bbc/13097847269.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a2c28c17---66186612335.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e5e1019e---85012697351.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160747545845ac---kavote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sql+filter+group+byPDF 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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 10676 bytes
SHA-256: 881acc151aa0eac92cf3b7ed45d04b953daf136782ae405ed5b9c1e1e8ce2ec9
font_01_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 17144 bytes
SHA-256: 6427480f714875bda8a610d788be8c8f315750cc393ff08f1f6779b936d398bf

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