Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d9487e97caf9e2…

MALICIOUS

PDF

98.4 KB Created: 2021-09-02 15:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 255f58219417f08c8bf88b5683d1659f SHA-1: 8ae89fbfaf72a553902654bd15b3ad8cf8093ace SHA-256: 88d9487e97caf9e2f5918b0dd46b9566700f7ba8e7f212121edd3c1ba658010e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://catamma.ru/uplcv?utm_term=problemas+resueltos+de+funcion+lineal+pdf PDF link annotation
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baeb939607---76411200094.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/zobog.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/vuweponanitomi.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac072126e---92348469131.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610110125d971---jalosagipelewiwazemuni.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a8472b04c7f5715c3b92fefadb1160db/zujanuvikekezesufi.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/viziwegulunotawos.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/bazuvinexupof.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/jedage.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/56136870132.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fa6bc637---43969356516.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/56393432536.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/51673919810.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zamunu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/xagizibalewozilotowedem.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d7aa1e4c07dcb3642eab2635f1b97931/kewevuzeturimomiza.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/fokevelabe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888636b3348---juwuvuvagerajojef.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dalawoginubot.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6049bf0345---21360599954.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/raxidulatigexi.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/fuloxenumizitowima.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa057433385---18124738958.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/63484034033.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 11020 bytes
SHA-256: 23425d9a5033ae98222f35a7e8fb174691afd317fbccf7d232738da6341a5e2f
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 25776 bytes
SHA-256: 9151f95796d265d3e55e81adf148efb5226bf00b8964986020508de70e045b44
font_02_sfnt_off000144e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_03_sfnt_off00014cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000164ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EE 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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