Malicious PDF — malware analysis report

Static analysis result for SHA-256 e733cf34380a1611…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 19:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41c50b1fb2527481d1f088fa0bb43e4c SHA-1: dc9e986c0d60701395363d7b8f4b0557ac09ce21 SHA-256: e733cf34380a16116051774448275e67b4b6de75573890f8b72dc8e7c6cb942d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and a high number of links suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1915406e8bd05d4ca9219356db339040/guzigez.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s9okacf8ud92m6dgslgl59l8qo/83134450547.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f54a5befc---70883299703.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f12mcbg72agevo7i7cnpmujn83/zagokerovema.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160758b33da2c6---85499347361.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/jmqr5085ufitq7iidjj4dq8l1c/76187660358.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f492c82b---lutuvugevulosikurozup.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/pudusam.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c553752460c---73855169347.pdf
    • https://monyetmesum.com/contents//files/32120152334.pdf
    • http://laweasy.kr/userfiles/file/67933734784.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/5bf2c1e7be42de2e132e30d1481109de/30980927934.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7c143b21ae62cc4097641c422608719e/mapabapitoresuxumogomo.pdf
    • https://arichaindia.com/userfiles/file/vadadanexogudebo.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3c1ed5a3---86827281660.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vor7k6v1snm4gl4rre2n7t7cn0/wenenebikolotivetena.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r3u6baer0rg6sv2to3a4vvq0je/38598898235.pdf
    • https://artenika.pl/fck/file/54834797170.pdf
    • http://montaze.org/democms/userfiles/file/sisabejemetegakape.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950f5063e69---53981640289.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/55258325422.pdf
    • http://korean-school.hu/hangul/userfiles/file/49731679403.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4b0810a1---14500855924.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9eaf36106c40e9433df16d8c49b0e355/33840118491.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=milligrams+to+gallons
    • 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_off0000ed71.bin
d6b5ae47b75bfe10be033dcf2b73f91132cadc9560072ab638f02a56855f197a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 17304 bytes
font_01_sfnt_off00011ad8.bin
7644e21295deb12666d3e985ed6cf1dc15e1c78a48fe12d3ff88067efe2d1bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 10312 bytes
font_02_sfnt_off00013209.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16792 bytes