Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cde59d5e4cc28c8…

MALICIOUS

PDF

96.5 KB Created: 2021-06-28 10:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1640af0cf73320783b57612d8ec1e1b4 SHA-1: 27baf54da5b12fad5bd7447e51034557126a9c18 SHA-256: 9cde59d5e4cc28c896ce3fa0017977e83125888c8a9c6455336500e893ef70ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088234803861---9280381862.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3acb3ff0080418471cdf32fc8b21478d/tubakuwarazifu.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d40f39f207---pabofeput.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2219327b---68014664651.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d51a1471765---zawanugirimavazodigovuna.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/xujomen.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f46c1870---68914931414.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0a93955d---rokiw.pdf
    • https://clumba-indoor.ru/files/files/19964357116.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e40b378ca---nogajapuje.pdf
    • http://tlxzkj.com/uploads/file/252306092787.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb4401807cf96a04cfd84a8d095315d9/ralurututedepozipifugule.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6a6845533519b7d3a32806a435de40f9/27499670671.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8c1da6fc76515500e457733c6650ae3c/52137482972.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26da4a82d8---19675614436.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5jme9n0t3ujb2qt9f41ije7cj8/30403219938.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/103d659d9b21b8f59f7981e7053c5e37/xaxewutomokul.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4bf0e9c60c662c552e021e996f39ad20/50970695108.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3b6d62a4---jumepuj.pdf
    • http://maynenkhiinverter.com/media/ftp/file/99392388853.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/vigagunafip.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77014f1e20---87036066661.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0843befff9b2add09a07ffc735c2fb40/19768667451.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=maplestory+a+greater+power+quest
    • 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_off000117f2.bin
df7105b48747879de6bd930a82448781b54ccd81b15438e9171e2d368340f0b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 10672 bytes
font_01_sfnt_off00013069.bin
b9081bd608ea791ea482219d8083225d55b4cab2d1aee8109155571034f8af4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 16984 bytes
font_02_sfnt_off00015ce5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 16792 bytes