Malicious PDF — malware analysis report

Static analysis result for SHA-256 a427007dd30f907b…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 01:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2ff901711f5f10139aba74d3c0d42e56 SHA-1: ff128d1c04a10cc8fbfde9358324aa381a256d3e SHA-256: a427007dd30f907ba15eb4287f6f68c6650614c7891e21c015819f6bed3d1ea5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of links pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=1200+sgd+to+usd PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089759f477a5---60354519972.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/48539663069.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/fujozetuvubu.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/nujagujos.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ue08metnsk5so0lmhk2922gnn3/ketugijug.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/vexixubasuruzokigaxadozom.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6pv3h39ig5e1kh18l7o97dm034/60486046804.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344f762598---91374212545.pdfIn PDF document text
    • http://candientushinko.com/images/file/boberowenuwaz.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e67e6ae9eb3bb6d612e716a55aec580f/93986620264.pdfIn PDF document text
    • http://sukhabalka.com/files/file/zarabotuvitemufezo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0038efd923f043981e5f0536004a580e/fikakub.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/li3dep59r4b2jf3aal3r3pank5/vodarekumi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160851e446e75d---50727291698.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210623_E9162C8CA34E14AE.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4dc66590---51746003783.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fuxesuxalowu.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kifufudojibenolodow.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/nejojifil.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/getijizefawokadonezitu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a6176152ba8370af0124a6824165c710/kopiperunilenid.pdfIn PDF document text
    • https://asi-filter.pl/files/file/vikuditilinitiv.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620bd8744f---gitomugilusov.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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 17376 bytes
SHA-256: ad7f7f9393bd3b1d0f14ebd1d1a46bc889f6a072e6f9cca6c863074229dd9b1a
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 10084 bytes
SHA-256: b76ca0f4ed94596f35a9852ba69da83163560c55688afccf9247774535c9ba2c
font_02_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1