Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a92ef337ba3994…

MALICIOUS

PDF

84.7 KB Created: 2021-07-31 15:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bd6bc34e236f106fb7482979a55f5a7 SHA-1: b4aec573739b1dd7eb1dc63046eb1b933f4558e9 SHA-256: 68a92ef337ba3994bfed7850fe7fc5d940bfead56d9e1d0fe73bb480aeec50e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs suggest a malicious document designed for initial access via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/4sske3fcr63sqp2mbsosam4d50/vegomijikegabexomesiga.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831c44e08e---wurafadosuxusovakodufit.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b496de230ba085074a533fc95290d63c/29552203784.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869976b5d89---rozuvivodudukijaponi.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/pipitopewo.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072020312136192.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c50f8c811640c4d8ff2983aaaa16f93b/sabojaxajasudap.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/17464f4ce8c9b8cc1ad204baa0de8281/lowagezirerilelexigiteg.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/wugusafelavuk.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6328280064.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e14ed5ac---nobixogek.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/ferimanutuke.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1622479091608d419350931.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/25163165718.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0kpe2vv0ahotgcrsiattshrif5/safipinupamegususaso.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/piramivuxoti.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a17962f0bab---88848761229.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/nufavojevawadikuviliki.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a117b26afd1---tufote.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b70feddb4---gugesibikoneporiporenoke.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5910eef0a3c104bfc91c561e0b04f9bc/14911327047.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2705070f---vewulabufovemivamelerexob.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b33fb9a95---15406059966.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56820c0a5d---23620252102.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zijotoredodivivakesu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fitumum.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/rojakimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=2001+hyundai+elantra+manual+transmission+fluid+typePDF 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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 16732 bytes
SHA-256: f34a457578ffe6a64998e6415b37a735d9717751e762234fe734e7832c8d597d
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 11172 bytes
SHA-256: 203ba43167ec12d592e3b8d3b3543f3d610877c825f734239712196efc7f6e9b

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