Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b637db28c32cb13…

MALICIOUS

PDF

96.2 KB Created: 2021-07-20 02:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53f14194cd94aded475705404402e398 SHA-1: 2847f42ce21abad049c6e9742278dba6445429c6 SHA-256: 9b637db28c32cb13357f188bcdbb00c5139329c0972637785dfc9e0bacbab4cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm point towards the execution of malicious JavaScript or redirection to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4965738086---63044406352.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7qo11f5lklpu2fb5kr5t1595dl/91735233551.pdf
    • http://ahchala.com/img/file/80587337640.pdf
    • https://riondene.ch/img/uploads/file/tamuragojokevukowosokis.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/p6tl34ubsoqohcfm4v633k3ri8/worugawe.pdf
    • http://interel-rus.ru/test/sites/default/files/file/wonaboluxavawipegakuwi.pdf
    • http://boilerservis.ru/uploads/files/ravafama.pdf
    • http://kayamedbursa.com/userfiles/file/dawogunap.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/nitexeruralapipofonelob.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fc2c6e46---vinesoluja.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fa43a51fc2d9cb88770dba866bcf47b5/99148638766.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff99bb292e---46926519956.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/zoturizafinigexufipalot.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2d4abb180da359cd73819e94ddeaf96d/61995710841.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6b8a08ef75f7a0a9575775ceea22c7eb/lagebidedezikuneg.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f9d78e15---9028816996.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/p3e3k0iliqeilj1p2tdqf1orqt/vemovotominewarulefo.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8f67f26dfaee3c2382e64e4222f1d388/20047967844.pdf
    • https://pacie.vn/web/uploads/files/fomoluwuwanewotusulu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s7lg5cs9lkg779lsq2v33hqco7/bezitufa.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0a22k0nqrnrma5pgik2dmbrolu/ruseregidoloruwutukiti.pdf
    • http://alpha-th.com/userfiles/file/8473065676.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/zevaruxawozipevuloto.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90fccc493---32843060919.pdf
    • https://golf-tout-terrain.com/publish/page/file/xapakibitapunojuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=really+funny+facts
    • 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_off000117d2.bin
5485083f59d4816a94825f022cf4688c1368f3815505aed3f9b6d456ef5bd1d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 17032 bytes
font_01_sfnt_off00014476.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 16792 bytes
font_02_sfnt_off00015c8d.bin
4f57396c8e22aa7c6c860c9c85bfb39338088e0a69d03dcc76c76d6efefa9fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8D 10276 bytes