Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6930da5b698ae15…

MALICIOUS

PDF

107.7 KB Created: 2021-08-08 12:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae9138c0b60cbc48fed0355d4d9831e0 SHA-1: 0330f25c9f60ec31cb44cda59df545e54ab47f65 SHA-256: e6930da5b698ae15a4f059229e57c386e2e8e3847ae507c94e81e021e4ff7d72
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d97a35d34208a7a96209a508789a5bab/rolut.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79382a5263282eed626bccdf55d04d0b/93813360844.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609025b869f8f---16207630306.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ef372ac5ca93f56923f94561a57f2b36/romom.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0i1fbs2co6l2vlge6b9bjfhbr2/23408448648.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0cdcddbaa21791fabb7321b00d05f162/84425501532.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/35116053709.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089365609395---4246419859.pdfIn PDF document text
    • http://grotech.in/userfiles/file/xuvotusuvugadef.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/91051126857.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083733f7bce7---17440360236.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/87280748843.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076751673115---59724721732.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca69d5a486---menudozomixesedofiw.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/11381334810.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56e61c4b1---12597583496.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90715673c3---pulikoxiwedowijufujakez.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xuxadomomofivaw.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/27471198726.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ef76318d---fuwurivemivakopegogazol.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccbbdde65a---pivemin.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a30485be08b---denusuvulemawobomam.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/ladipugunubekalekar.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/20001806262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=noobees+2+temporada+capitulo+2+completo+en+espa%C3%B1olPDF 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_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 19444 bytes
SHA-256: cb40c71f9668e5e6499f0534768691bda146ae360d3c7319b32545a64b5f43e6
font_01_sfnt_off00016aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18306 11220 bytes
SHA-256: 57a564e38ec19d915f43747b731ebaa88a944be144b06e96596c9ca06a2826cd