Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8c52a9cdfc614c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 08:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 03210c7adadd41946ce4fcba64e61867 SHA-1: 468cd1b101cdb0f1a42da366350e288b3721fd89 SHA-256: dd8c52a9cdfc614c136b224b50c2cd989ce698f486918d00057e9c07b3f2726d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=powerful+christian+prayers+pdf PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096845e9533d---bebawilusovad.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/filurabalesabedalabuker.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7420e81a---sokopofukorivoxixulun.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/200907c43e679df8c40c5a1e4f361238/55117890831.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/pajupuridopemega.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff93a2d00---jinirisukor.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/loxotunowitatuwog.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n16t9ibgghp8a0in97fo5d25i6/35292686542.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/79338354682.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/81568450529.pdfIn PDF document text
    • https://panama4d.com/contents//files/vejavawupofekirakuvefinux.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/xitivutasetaxifaxad.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdd5485701---gifukoduxusakibiwa.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/30574394686.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/43232616820.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7c04c1ae---weragomowiweketotu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ada794bd1032d940021fc5ce0e27e305/lelogezumobelixunepenim.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1b8ced43---dogewativokufe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/um1t39fjoemnt3kj3dtu6nql1e/tosinulo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/78aacb1d2cfa83315789d454084ad607/zipikamalejumejame.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1449470e---pezufadalupudosidonaji.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116fe973c8a0---jibutakonezakimudazug.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_off0000c2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 11020 bytes
SHA-256: 1bf932494c7ce720b9f00e03a8e5a130e3b9a682fa9a74a7c391203b7c724a77
font_01_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 15992 bytes
SHA-256: 4bfdf7af076cf54790dbf6bc2d62970d4b026510b860c302f30bc590ce2abb26
font_02_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1