Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbbb6c83ba2130a…

MALICIOUS

PDF

75.5 KB Created: 2021-08-28 01:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3bd2ff4aaf29ec48128b265078a26774 SHA-1: b5852fe1f8c534c03f69b4fbed00ec2bbb513796 SHA-256: ccbbb6c83ba2130a7b02eddfd15f9a1dd42c66bf2935c002b01bd65257c3c08e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=slow+cooker+cheesy+tater+tots PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b6297b61---waxaletu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/91274052747.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/71005008371.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/varuxebezufarepur.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/13384560061.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e3a76f52c2f5fd0c3204e5f241c96ac7/biveb.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lifiriboluk.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1413341a80cf4b98279aa3c73c50f50e/zajedelisimisiremuferive.pdfIn PDF document text
    • http://aroma--style.net/files/files/lalodewoxurireguvem.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/gozatuw.pdfIn PDF document text
    • https://loctra.net/userfiles/file/69892499861.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae68a77247---gavopot.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41ba2e678---velawilufuzitinifip.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/tapurofivegubegufefimi.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/wukenulikixur.pdfIn PDF document text
    • https://noddy.nu/images/file/21867384889.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/357cf03d2443fdf7254f51a250666e29/jidumafepokipor.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe98dbbd7d---97010199297.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/mubisawewavisud.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cc837de81f61d279c4f81ea75eb2f737/99844519041.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f810da2b---23710591668.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/irujewowepapipezasafiz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d9400c91---76961391197.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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 16456 bytes
SHA-256: a983bed19cec67e9a3a8e5e35386eb02b5613fd84a1eda45acfd11d702f2505e
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10496 bytes
SHA-256: bc030ef173577b7076431bbed4136ed3fa02a5621483f57aedaf85800bbff16e

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