Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8d932a6c46da37…

MALICIOUS

PDF

106.6 KB Created: 2021-08-10 18:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5d08c9085af09f0244876c6ee31390f1 SHA-1: adf6dee85f3618e69d5ab2c1a90d5de7035453e4 SHA-256: ac8d932a6c46da374120a8e8abfe112c728ca6169cc030b27600551f0ba8a3f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=anna+akhmatova+requiem+pdf PDF link annotation
    • http://ud2-140.com/files/77014402517.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38272135571.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/21991446597.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/53670959135.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5863a26de0---meziguvutuvekix.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7769479199861a7aa6d2c02d7c3e2758/tusitudav.pdfIn PDF document text
    • http://hevolta.com/upload/file/letenofim.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/venefovenutotisepese.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d73433c92---nogewidurobodifetufo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75a5e9c3---63799207968.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/10df690578f349e634627332b07eefd1/bagumelexixi.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/41816692384.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085696ececbd---fijejamagugo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/rifatudow.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/rirekoramedabuvav.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/420774e6f6ab6f81b13c361f00a4bf26/74534994408.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc6a1cc091---gawuruledidonawajipivirem.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b21c0c80b794b9f8610f179a9e74768f/jevoxamobebirakigasugadi.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/vojijodekubakinuf.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2caebe4c---pusoxupikomavi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/43610ee6a5abe6c368e731855c273450/votetusosatipaja.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/tafej.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/u99cs7petr3ufcp435fd07vof0/vijigugilavegefamakom.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gigigopojimewusazuf.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/52deaa9d99df3ecac7ff9f700dbb032f/lamuwamol.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989bcd00b18---53637358806.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/fuwovomamabo.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_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001508f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508F 10932 bytes
SHA-256: d57937d74853bb5c30797cb30e30704d1acbb66e808cc6763380347d5ceaf8b1
font_02_sfnt_off0001697b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697B 18980 bytes
SHA-256: df78b7110116955d4d5edd6261530866d349477eeb51f74775402542315632e7

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