Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccefbbeaa4d71ab1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 11:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21de21d69eb08904ff9f2283072f8219 SHA-1: 69363f4cf31018f037f51bdfb17fdbecb7d35da7 SHA-256: ccefbbeaa4d71ab19dbbd05999f8c79a6d997a47e0f1b45ae4f0339a3f5541b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=wish+ender+shattered+throne+orbs PDF link annotation
    • http://euro520.net/userfiles/file/16256159401631942347.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dnmqbaildevm5bhmcl8csq0543/42090715911.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/27308559967.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/fufidowupedaxepupa.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d2dbfdbae002a3f150b8d0a57bb606c9/nukakizugotediwutijo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161173076223bc---kuzeri.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4ff50fee---76734921210.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/40635905898.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4fe36c1f---62575937453.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/poxefuzenufatixew.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/48656793093.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/sakus.pdfIn PDF document text
    • http://apgindia.in/uploads/file///nolafigiga.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/85871279631.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fec639d09---jazawitaxatubobajixixa.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/xeruda.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8m8vmdam4lr8ov6f5u0p0cfrn4/kopotovifuwisod.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/foxisusilisit.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/notit.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/letirudowijukazuwakasezo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fpi2m62bo5ig6qffqmjtmhda45/24528695529.pdfIn PDF document text
    • http://gdfsztal.com//uploadfile/files/palopukebegukixev.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23642740744.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/jozafu.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_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 17496 bytes
SHA-256: 74d40132d6b2efee4e05c88a44df27695465783765cab2559c327f51f7a76f52
font_02_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10432 bytes
SHA-256: ff34060888abbc20d0529fc31cf0f0146533923e799cb8e78b842e84bec3d083

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