Malicious PDF — malware analysis report

Static analysis result for SHA-256 67be5685996a11b8…

MALICIOUS

PDF

80.6 KB Created: 2021-07-27 11:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3a3b9050e32de0e9c1e1dfd808aea1bc SHA-1: 2e2824c0a307bbccd772f8a84d26dd9510536c2f SHA-256: 67be5685996a11b86ca0a07ba9d5c87d2e27aeecdb82879d165d9c8eaa19ecd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. Embedded JavaScript was also detected, which could be used to further obfuscate the redirection or initiate malicious actions. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://banghetretunhien.com/media/ftp/file/wozutigeje.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7493f4cde1ad956d784a309add749c8/27854913973.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/31809586474.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/76299650287.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bidofadozagulijafukef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768fb90c393---bufis.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/uksr90iguk3i6invu848a5plj7/23182694494.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/58968050684.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073569af18f9---83596199477.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c0d20a9f---biwin.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/98128025531.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/16286434655.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e89267a57891996a03e0840af1d43b84/28465557589.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ecb6c81a---93369753257.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hur7qjtb3emp48nu7hn6idbmuo/nenazomudenelepekeso.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0df374322---66095286790.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/62224460586.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f14d0388b---gakonoletov.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1ef3pk1119q3t6u3eflqm21651/mopib.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/kesinenazetutizidelafuw.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zikurufezinipoku.pdfIn PDF document text
    • https://signika.pl/Upload/file/sasanuvukurumegipuzis.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a5c68b9a76ea990da33690215b6bbe5b/mexikowaki.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fc8733a8cc51c04ef65e08a6752b38fd/70686269377.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3ec1173e06b4050887cd8291042944f9/zazevajovugudilirivul.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gq35i40g5kerii80ppq85rpug4/sefejutekawegevivofizun.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/88965139952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chhota+bheem+and+the+rise+of+damyaan+full+movie+in+hindi+mkvPDF 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_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 17820 bytes
SHA-256: e078db42efcf33d0a234bf0d3d6e4a124f4f675de6a6c5e78b9c3ac640dd6dea
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F8 11160 bytes
SHA-256: 69967bbed8051b416149d2e083e9a3a9e23e9f5e5d8282a7925c87c99c7d4013

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