Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcb8f352d2a4ced…

MALICIOUS

PDF

89.7 KB Created: 2021-08-05 22:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b258c3336f917de626ba72398347cb3 SHA-1: a9ba6eca53ca9059c755f06e81f5cdd4e60c18f1 SHA-256: 9bcb8f352d2a4cedc5f8b7339f9dfa8b0fa9c47df30bc6567cb5c78dad0cb1b0
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://esoftland.com/userfiles/file/worenulidejef.pdf In PDF document text
    • http://smn68.com/clients/75339/File/zevupuk.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/74558152160.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed28407cfc---94567258982.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/weferosawebixuzuzop.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2686df871---83440207169.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c75f39d27---52826125086.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4aplsdgkn6faefp91kf0h7pfan/90960109881.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7ff840bb09c49e9dc5c2bf1ec154aba4/gejuxujusepaguzivuguze.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/muxanavibubulirujetibudox.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2807e81c7fa3379ee0782e5f180d2b97/gafulidavedofen.pdfIn PDF document text
    • http://aps-mes.com/files/file/lojuxetazijiwok.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/loxawapozisi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595ca08cd5---bigobaxokuxamerisavupezad.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ma8hvrh0f4ga4vjovk54gl1jrj/lirutepex.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wikukajedapitegowepa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xupowuxibimelebidep.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/gurugiwotalanutenar.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-31/210731230412416047hr94pdbu67rv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf1c67bfe---35277679452.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/fifepos.pdfIn PDF document text
    • http://poultech.net/d/files/dodepixujimiguxazuvuru.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/masojusifefadifefi.pdfIn PDF document text
    • http://e-hematologica.com/users//file/52726948405.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/pelufog.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o3cdsu3bmprjjedkshmervv865/82919842837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minha+impressora+epson+l375+nao+esta+imprimindo+coloridoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 18612 bytes
SHA-256: e209fb7253741db9b632732ea7cad4f957f6c8fa4dba44586f9aee7b8e14bc1d
font_01_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 11128 bytes
SHA-256: adfe1d2b67d079a1359f7dcda6a3cfb887b2ee568e17b55738db02b00f6928c3