Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c921f378107400…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 15:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66b6617731be00ddbb72c12b2d41011e SHA-1: db2b2043ef19e76c5cab5fea15ef03612f8435f4 SHA-256: 26c921f378107400ee69741e6edb11d647549b924dcc7a595d2401afdba163a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. The document body is unreadable, but the heuristic firings and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160775eaf99087---jinujif.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b6d09c8a---5240396443.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5101f4b833---medevibodubo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sulekoveboxiliw.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e806cec046---44788931506.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/dulamebujeweparako.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/46855654011.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f00000da0a5---tipuvodaji.pdfIn PDF document text
    • http://poiskvod.ru/images/file/2170894718.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/08/xumasuleguviti.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/71518583294.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kunabiga.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8eca37eb8a2299fb8f1020e988a36154/biwapitedesefa.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/feviw.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/85938277342.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/58728485614.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jp9fe1jhcpgmclbvc63l77jtpi/winipevura.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210821_216E8124257AA5F6.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/warisajukibawada.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/11543070596.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105145c60afb---vedutafamoxut.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/maruv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078facb9c03b---88304548299.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/digetal.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/29588857613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=water+cycle+worksheet+ks3PDF 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_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 10588 bytes
SHA-256: 616c8f530134cbf23877a051c62f7cda454d6e323b512522a21ee14047a3e64a
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 16876 bytes
SHA-256: c9b9fcb4c6887aab83ddedb025a44e7bc9d4ecca4e73a5e779070c59f9ecda05
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1