Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3c7fbea34a6acb…

MALICIOUS

PDF

151.3 KB Created: 2021-06-29 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de44955318c8ae4fd4dfed635d5b0dc4 SHA-1: 1d17eb13d0cfcbb888f167f34c162b2feb5a1c58 SHA-256: 7f3c7fbea34a6acb65a62f35964473da95fe74fb1a451a624220544664ffbb86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on multiple compromised WordPress sites, likely serving as a lure to redirect users to malicious or phishing content. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mdgudi48c8r3ib8ejab1unqe7u/zozekafabujuwotolutadune.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7df02ad74---sanigigozedev.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6db3vkdq4lcrqi2jqrbjbqm6bb/35271886660.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086c945a3240---20274655064.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28dae2188f681c2f9cc14fd4715f7be0/zarafamubipejamamo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b0584c021fb0ccd682a35185cbd15d81/68728157795.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1k7hkthj7sgfhrd1d6bumv1lap/bogupog.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lamutid.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0b7bcdec91b0578c630bdf6cd7e1b7ed/kogirawamewojasibizumux.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26370e822---wonenasifamazerepimurafop.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/modebadoro.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/55018fe66825be11c28baad2ca17a6d9/zibamajatixuvofib.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/67014447231.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cdd4frhihe7gc45jr781kq6f6k/kusekurudedudafik.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd705531ed---nugasij.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836372c187d---34773836573.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce8957758---fetoralasivimaxex.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/54556129372.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160711bf1bb9ee---bepewokofawuko.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1405b2e8e178c2666f3e037126ae20fa/65533373261.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02f2e72178---jilirokinupasuvegaxurifin.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jajozebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=explain+darwin%27s+use+of+the+phrase+descent+with+modification+to+describe+the+process+of+evolutionPDF 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_off0001e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20081 20060 bytes
SHA-256: 919109959046bdd147ee02404d1fe5cc12b06280f42aa58ee2395469fe52249f
font_02_sfnt_off0002339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2339F 11396 bytes
SHA-256: f349d929079e2dc9216beb33ce45541c067c88fe0bce8798d25a5524140f9851

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