Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09166655a920253…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 17:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5cd9f886b2efa66a966398c979c6415 SHA-1: fb0a746f6b92f8375ac2d4fe50849e634fa18545 SHA-256: d09166655a920253ffcbe10e5f8fc211435a3e5aa04252a9d85b28011325ecf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=light+refraction+and+lenses+worksheet PDF link annotation
    • https://fanaf.com/article_ressources/file/vigewexabetivodi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3ea6b072d---nekixojigiwoju.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/188d57e5cabffc313ad777dd2c03c41a/11312239743.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9f9ca45d7b1465ba179013ee7b20879b/71347727649.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9b9be582---ziruvifozizuzejinuz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6aff647013d72ae0ee164bef0257941a/norajivodezizojuxef.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexejinemaxepex.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/rabubifulokukuzanatoweri.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/55833589010.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a23290ad43a---dimipomedub.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/tivazodinox.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/65oofiugqu10uj8f4os3hpog8s/rajisanaz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35208d0baf---lonegebukaridezipopumurok.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/31175960981.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d485d62e51c---vosalixakutofusawagid.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xokejiziragigi.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/lokovat.pdfIn PDF document text
    • http://generoussecurity.com/uploads/torexifipikepipatamiriwar.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/86722852815.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3468dc3d7---28046126764.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/263a96e0ac3c386df98127e054b00322/metipipenupamotuzunejop.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/3945392996.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zisomizivenitugotix.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/68235658617.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dde14db8d65---xufewegodagafo.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_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 10888 bytes
SHA-256: c23ea38e2d255319237d5beb5980233f2d945c42d18d6a3761934275852891fc
font_01_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 17300 bytes
SHA-256: de235dfa12b4a489fb09d9ec376a8e0186850b9178f99c52f9685e1db5c893b3
font_02_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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