Malicious PDF — malware analysis report

Static analysis result for SHA-256 938a11d5189c6edf…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 11:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 058a307b2fd6d2f2819907c8f1d29d99 SHA-1: 5d8bb996ce09d555e2485fb8805fa53c9fd32264 SHA-256: 938a11d5189c6edfa115feecca430fc39fc15426799581e226137d30b31010bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=how+to+unlock+a+locked+iphone+7+plus
    • https://unibel.pl/pliki/upload/file/kuribiwekaxelufakufesa.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/55722817903.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57eed70e2---goseruwinap.pdf
    • https://glbtrader.com/userfiles/file/16180359986.pdf
    • http://solemarservizi.it/userfiles/files/fefokijalisijir.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0c95724331ffdc0ee7e33ab0f2980c00/bewudotufawof.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d0ab5d6d1f18872a83182e66725dbafa/64737522904.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/92403016629.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pv3ga1g5t525ro2j7fttjc5sa0/kerujizuwuzupubi.pdf
    • https://ayurvedaemart.com/uploads/file/jevajiloxanik.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1bb2e6c9f---20167864057.pdf
    • https://betentour.com/sites/default/files/file/19087625264.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728b07dff1b---nigojenanomoxudekekizitu.pdf
    • http://joewhitefamilysite.com/clients/59967/File/lapavokojidimaxegopinuv.pdf
    • http://e-hematologica.pl/users//file/84999889033.pdf
    • http://buddhavehicle.com/userfiles/file/suboxixujevof.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5ff249ee5---33711887745.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba59ce41e2---jokonuvuzusetogubuxiruliw.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843969e4e81---64734928501.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1496b2d6---60448896002.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f25139a6ff---96614902117.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/jiter.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/16081686004.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf4.bin
4e7ab4cc3258a73931dcca9a0846c12b23a7f1988016ac4cb0f463c1ccd9eef7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 17040 bytes
font_01_sfnt_off00012aa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 16792 bytes
font_02_sfnt_off000142bc.bin
a8186837be7f4a22dfb798d92c399bea04f82040ad61c39e486dc04025da0257
pdf-font-stream PDF embedded font (sfnt) at offset 0x142BC 10828 bytes