Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a3035ed2bf9942…

MALICIOUS

PDF

85.6 KB Created: 2021-08-31 21:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5eabb36de2e783cece7f207905c50413 SHA-1: 007e352f1dc7c104c4a51595e4b382cfa58b2eac SHA-256: b8a3035ed2bf994223379497300e8a1d789c967780dc6790f48dd9af2e51250a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garglob.ru/uplcv?utm_term=iowa+department+of+motor+vehicles+sioux+city PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a9ed17971fed73d5517bdf52af8a80b0/92060270929.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8a272d9d8133bcf7ebcde244d65ce8f7/40902959181.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/nomawudodedopofiwujugari.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/96es91qrg123sf84ouppv0rr00/51417271706.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a83eb0b9d9b---bepaka.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6259584fb3---rigufalobidiz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4c9c7c62---jinimotumo.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/bimawegasexuvulip.pdfIn PDF document text
    • http://berbun.com/user_img/file/bekasesuzikivudewukeviluw.pdfIn PDF document text
    • http://sartor.ru/upload/files/9837467094.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b258b94224b---kejiwepelujutoletegajuned.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/gijoxagepeguvabifinafo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b1135565---85217670770.pdfIn PDF document text
    • https://eslms.com/userfiles/file/zopovewupi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c4acf8b9a0c75150e5ba7c8a2dccd3ea/33767662018.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/01036dbb7a44da72a7d0802e1df4fc81/50933128102.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/mikatusopuwotug.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/gabaniloxisawazagatovo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d809649668---benobikop.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b5014379---vurimozisolotiwabam.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/21676024579.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/84739297269.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/23454865157.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/33q461fci8j78p54bb3gtq5l9q/94150740240.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b684eba44---gezenuzidobebulazemowu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/48109151127.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 18060 bytes
SHA-256: 361a4e14b466e85aa398a8652c0794ea5926dcf1a46c58778be25ffd865332b4
font_01_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 11304 bytes
SHA-256: 275305a4eb5e23c6577012ac885fa180bbff30a46f48ef76cf96242ac5815b73