Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ff9317b2e4efc6…

MALICIOUS

PDF

82.6 KB Created: 2021-06-27 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad00f76e1f38657e9c982213d1868186 SHA-1: 7be4e1fe60c8767237625b9e293ebee9ec560ea4 SHA-256: 63ff9317b2e4efc66a750c8a26891ecc2414e880c591f7db758005f3294a3b8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caed7d0f78---50957808793.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/lomiwu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d8621e8---tunovukuxesotuvol.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e56d8b90fbf8a11313458d4924d414c8/71847549223.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/klfmsnm5g0u9r51e2vscsue9op/22805092378.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c16cffe4---10713407509.pdf
    • http://yongqingtech.com/d/files/miwetesafazajotugunelo.pdf
    • http://skincarebylaura.com/clients/862251/File/57061765200.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2ac9e65---kajatirokur.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/5801634459.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbae42a6---26965921406.pdf
    • http://bscartridge.com/pic/43182279753.pdf
    • http://digjamaica.com/app/webroot/files/zujesewobisip.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xugajinunawugizimudodon.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4d0a16986ade739b83fe8ca8401331ff/83815415948.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/106729a73c8e33a1cd387cf402b52e0a/13877322.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vebabuxagofex.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/db24ae343bf3d4291c0a61c5229022ae/xorudetakogelitakegiwi.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a4bafef667f0a97892efe1d62c9610e/53486567059.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb9b78efa---wukavazelemumuwenezi.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cf600be0264746785f1789a50adb9530/fejepal.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8sbohv8rfo0ilel508qnn3cmg1/risepedajeduxazesavujud.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ce7a4786d27f89f321228a4ea2803133/26485373363.pdf
    • http://mini-garden.ru/userfiles/file/46278034065.pdf
    • https://dm288.rs/slicice/file/kopejum.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4268e5e2f8---talufon.pdf
    • http://c-amc.com/upload/files/pufisosizog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=brownell+and+young+process+equipment+design+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1a.bin
3a00ea1a4c6f9507746d3f300ddd3a0fe291ef314f2e18797819b005aafbd663
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 17780 bytes
font_01_sfnt_off00010a12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 16792 bytes
font_02_sfnt_off00012229.bin
9180d88875548a7a2506324957255474d3fff21cc03b8a1f2bd10c78f9c1c688
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 11464 bytes