Malicious PDF — malware analysis report

Static analysis result for SHA-256 411afc648eeb948e…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 16:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dc4c31aad771a4b0750703e4214bf0ed SHA-1: 76fb1d9d5011c305a476e2c78b6b07d5bf8f5d46 SHA-256: 411afc648eeb948e7bdcf6c78f8b2ccfce14ae9b08eb30c2310882371886a1a8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document impersonates a signing service, a common lure for phishing attacks. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://infrive.ru/uplcv?utm_term=how+to+place+digital+signature+in+pdf PDF link annotation
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1cfb09ee818ff3e4f27b05b037c07a1a/7114384718.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210527162212470883.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/torejitogekifiwon.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pubuzedud.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/26ea43706883a291517dd1fbb275ec27/62557999144.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/51289903181.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/42274690495.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8c69954c---kebidezewegibexuputo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2f619bcce14b792e7fb7d61e08e985c5/kumozegoponamuferufe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c7dc981b1096064db0f99825fe0d9db7/tawimesitikilitikovosixug.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811da500d12---10935588992.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/tivelujujeketoxanojizep.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/k1kqm6rkc6en732co8lm7ej5ij/felenijinubokej.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/8fhc71ont63l0mhq2avabvl2tr/kofagebobepilizate.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060812485173499.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a9d7419fb9affeaf803a3d98a801c94e/39981185935.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kilelikufetewuvir.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3de38ffba1a15da885fa2bd8a5ee2894/xepirofur.pdfIn PDF document text
    • http://www.bandungmesin.com/file/velonujelinano.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a045e45ebef---91037863357.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f398b7340665a3e31093a419a7d3e7bf/wupazadunifebewowet.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7e9e36854c3249e40a5cff005048b200/lobipudapemoxifovakara.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4ea9d7ee---71585396419.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/92644536441.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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10972 bytes
SHA-256: 35d913dc0e7d397a04083c7aa21e09d4e6e8eeeac27c65017e3d46247f5a850a
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 17112 bytes
SHA-256: d78f75d55a1d5c55310fa83b25848c0b4fab6159e7b462f1f1a21cf9438e0e62

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