Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a767119378e669…

MALICIOUS

PDF

89.5 KB Created: 2021-07-10 10:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36c04fce8d721d774c5e9410544ea45f SHA-1: 223009ca2bcf1f35bf6ab11a08568fba54fa457c SHA-256: c4a767119378e669b2238fde583a365b34c3a81e42efff9dbae99f9c937a20fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6fec2fa5a580daed2aaa3d76261dbade/varuparedugi.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14f6eec39---ruvuwupiwowoxezipofu.pdf
    • http://yuha.be/_files/file/12400705530.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608405dfbae92---kavufarup.pdf
    • http://brmxn.com/userfiles/file/20210521185032_u0gez0.pdf
    • http://yuanyoujie.vip/userfiles/file/ledozijalomakanofokexom.pdf
    • https://kristinanamaste.eu/files/8592368114.pdf
    • https://bestcoloringpages.com/userfiles/file/kujufofowazifo.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/92d494c19e42091e08c8027f8913f487/zemuzibo.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9683e5efc---xagazamikifuguna.pdf
    • http://ropesadventure.com/d/files/17138914391.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/5e03a803d330cd7274e849d4dde03bcc/xidoz.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/59296958021.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdb03e8b9---77079178350.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b302d1e9d2a---pejijawejolanenesuguxir.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/s6tt2251j77f4f7emo1oatomel/23241728849.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607def881fef7---49316053430.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vflkvpmht94jfabc1qb6vkru2g/61830518029.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9032add5c4351e0afc03df443c4a1258/jatudu.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8da3252a48d7576e759cf7a937e1fb1/jotosisoju.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d0aa1b76838d31317d55e2dc1addd568/porolopivodoxevorepux.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0b13388dd81c783dd6ac3626f126655f/56708070200.pdf
    • https://bywuf.org/upload/editor/files/83986552665.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e9b3e2f7322756a78cb40c77270d5443/jokamet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+meaning+of+till
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42033ab7f---29555745376.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 16140 bytes
font_01_sfnt_off0000f9be.bin
c5f9cdd0a00d79e857d68bc730bd42686021d55ee68f6aa42bada1c4acc41b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 17608 bytes
font_02_sfnt_off00012849.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 16792 bytes
font_03_sfnt_off00014060.bin
d3ff8645cd8c88d258799928a144065cae49d6b6610700e4870f5dbcac43c14e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14060 10552 bytes