Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd02b56d5931a51…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 22:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e15a5dfd144b4bda949206d599fe3a56 SHA-1: 3a89eb4872a1f88a2d888d0275ec2f65b65eac63 SHA-256: efd02b56d5931a51130d33ec5cc155ef7712b2376eeba29f1134c39b6363bd7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=manual+normas+apa+externado+de+colombia PDF link annotation
    • https://hagepoorter.be/files/files/15703278377.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bf38d3c96---88560511764.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ed2d61bd12b50a4a334b7f6323ffad64/xurimefizovikitisejodoxa.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/ruwonojakatidaloku.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/10372855663.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da75ab3bed0---14252222887.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9c1a488---kezumubufakenapazo.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/68502074600.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/sajexamapiviliges.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/85706938950.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4tb2ph7nnd3c07714df7iu662t/pawefuji.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/5288e47697cd78f9796a05311c074275/wujuzaluvavozukux.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e68cf80769---30800597489.pdfIn PDF document text
    • http://cmtsport.com/pliki/xixozel.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee42c95479c---zevemufejobabebudazupuw.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tuxekixuxujawes.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/354b3b6c11cfbedf4c08fecec2afe1e6/59009676872.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d215b12f0---55429318858.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1c19c48ac1580fbbf56892d92999206f/wekadoludaxuz.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/7574747853.pdfIn PDF document text
    • https://tl-systems.hu/files/files/lirexitapibolowi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/73fb19d0c18ea69e1eff6af984bfef7e/sojixutojaxotuli.pdfIn PDF document text
    • https://paperland.bg/uploads/file/11405509009.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/38039549133.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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 18548 bytes
SHA-256: 521d0d056a55994b33720f715a8bd88e226c4c9dbdfc5f7a1067a49c38bf4abe
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 11008 bytes
SHA-256: 0bd82acd75e7c6c058fc51260fa84c8c68cef3dc4a16c6ff598de044bc8b928a
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1