Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3948cd234bbdd2d…

MALICIOUS

PDF

95.0 KB Created: 2021-07-01 14:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49ba21fb30d9fef93df9d7903e62ed77 SHA-1: 74f395f905308f906adf9a152b8bef1292a63d29 SHA-256: c3948cd234bbdd2d54d537e584e8f63f78613bfff557038db08af3f1bca69695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=business+plan+sample+ppt
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea0bf18bf---68435450138.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad474e53c8f---kanejopos.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/79306d9de501720b94a033c6ec40b9d5/46492134682.pdf
    • http://gibisch.org/files/files/barejagexadifepi.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933bac71b4e---85107073944.pdf
    • http://sosnovgeo.ru/userfiles/file/51053126831.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8vn7rtjma6n821u0vpk2l9cut0/guluvawojogexik.pdf
    • https://gbagencement.fr/uploads/file/79013399075.pdf
    • http://littlepearlbooks.in/data/eimages/file/jisefivoketovilujepifi.pdf
    • http://utuin.net/files/fckeditor/file/xuramirawokosafuz.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e9971da6---75949413784.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/srh1unr114ag53f1vtl0ifpvs0/padokafisefesosir.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ae6c9414063f82f89dae3797927dedfc/66126098118.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j0abcb53sekto5166rsmklgd22/89021716727.pdf
    • http://budka39.ru/files/25762503903.pdf
    • http://nusamulticentralestari.com/Uploads/userfiles/files/gilibukuruvawodunamoj.pdf
    • http://creatinglifeoptions.com/userfiles/files/7345753997.pdf
    • https://kawanmto.net/contents//files/taliviribabikarogodu.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffdd24f79---20462841824.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d14eb76d1---pubowuno.pdf
    • https://calendarsunrooms.com/userfiles/files/26223740404.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001125d.bin
5706779e78197b1625decd731cd978933cdcb988b81aa705643e214c70f91e34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 10344 bytes
font_01_sfnt_off000129b3.bin
52535c539fad468c3a9ce955899fceab7c95697ea90eb58a90c761776584d77d
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 17456 bytes
font_02_sfnt_off0001574a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1574A 16792 bytes