Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff9ffb9f65ce34…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 14:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66ce040dee28dd208fa4fe868db7de0f SHA-1: a18328792497fe2ebd23b6cbd4fa312dc6f8b93b SHA-256: ddff9ffb9f65ce343d48d45bff0d317e1ce4e18dac2eb3b00e08455338dab196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. This behavior strongly suggests an attempt to lure users to malicious or phishing content, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9g08p9g9nvg37iv3hf7crii4qb/14841173419.pdf In PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/mepazetudimatotubegejow.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/31ddai8okj0cckt3r14ghcnl9c/jirenejokemokasitogoruw.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/busajolekalinuwoj.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/simuzubipazuxinupipiv.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/63070733189.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/xipanajufabasonavigoni.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/f741e510315787beba79f8d165e0492e/11630027173.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/befabozat.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/37d33cc10ad22ee2b070807e262ded85/35489509074.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/mudadizojidupom.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/21cc2c84dede6d2597736782e8c7369d/zurofuzusekagidazidilux.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7b8d3803a76e574d340d17f7f954c94b/mosatobu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e37a66d2c8401ef60d5e72f2a5bed54b/xaguxagokilefedujazik.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/71139240452.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0035630b4a8d92d3d1c6c444fbb83551/82740528647.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hjsbcd09ul3j89vh3cjb44j6qb/52627599598.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/45604428094.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/1b75222ec18a062b095e7fe12f388d85/fatejimokis.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ad6cce976b4830e5352d2c54ae723322/motagowabidugela.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/58072040557.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/38859310832.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/varipagarijokuzugorapo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/43132390674.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/vusefavezewusemepabimad.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/38767184398.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/7817962163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=history+of+greek+literature+pdfPDF 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_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 10868 bytes
SHA-256: 5dc24b45d6fe95fdbe371df9f48ed1aeb538028f0a40b1bfa7405782a466065b
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 17964 bytes
SHA-256: bd4f817d93bd0940dfb878923cdbb737cb103f20cb5dec48753d3a522a74f427

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