Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7cb66380660677…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 15:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdeb0eb2a1eb1ebbedd766dff180bef5 SHA-1: f6b70091edf55d31fdbc5dea8a13162bf47d66be SHA-256: cb7cb6638066067767d7adf184f1b5ebcd8a573130ee6065c158c45e85e277d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the overall structure indicate it's likely part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=vons+job+application+pdf PDF link annotation
    • https://novamakine.com/upload/ckfinder/files/46758208832.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/migexozamo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf21d3110---67236462429.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d185deb787---32516359810.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/2b58eb803931ed7b0ec21e1e9d1a6d1b/15613793346.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/etq2pgk0s5f1cokqhaal42ijmo/58366280027.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b0kqo39rirbgvu1ost07rrpqb9/dotizobolemexibumaguwip.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/jelelima.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094409c3b98b---gilobovepuzokimozumiwokev.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075958033e36---85313842456.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/gezim.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087024ed33a4---gasojavedubemubebodupo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/38487555303.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/nurutizan.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca97521fb5---figeterapediwekuz.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/6768234767.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210801140723_hoxdlk.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ded1192a73fa8f28d3d08ee67efb1f2/lowiligumad.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/1689919854.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879407eef78---5707863096.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/jupubumisixibawobawiw.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/15789854492.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cb2b9c109c000f72fdef2a14d6e9584/73058372904.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d302624fdb7---kunezixujaninijakera.pdfIn PDF document text
    • 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 10620 bytes
SHA-256: 1c0ec4043704a3d8cd9fab3d1cf57b296e727ab3cdf99bcfcb622cf57a86fbe1
font_02_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 18608 bytes
SHA-256: 05505def8824988053bcd2badcdb4153ede9772ad3c24601aa57c278d5dad6b8