Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0bdfa914881211…

MALICIOUS

PDF

95.2 KB Created: 2021-09-18 10:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5145a69591c444db282d97ce9c63848 SHA-1: e1a8aa7b0277d53fb932685bdee90f4fa944c1f1 SHA-256: dd0bdfa914881211f94e02b76f8bf293ff11f99e684227b6d54ffb50f544e808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=mortal+kombat+2021+after+credit PDF link annotation
    • http://szyoujin.com/UploadFile/file/20210912084637176.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sesuluge.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44720715828.pdfIn PDF document text
    • http://mayjack.com/upload/files/lufutigupemowivubakaver.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/62924590523.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/kenopugas.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vesekudigixejikakinit.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/giluf.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c003fc48ca6e22d860f2bd994afe2b72/87417601659.pdfIn PDF document text
    • http://paliukenas.lt/i/File/jewujomonedalajip.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/1659277148.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/tudovilelorawopumomu.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/rofigi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/83232099339.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/85432517865.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/kepalemitezadunasataf.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/wuzavulanorudato.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee3a4bba9---dabisemaworukawipudire.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613306007b88d---vofatudisu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b1ce6d16---83698360380.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/1996406824.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kexeromawowexelazek.pdfIn PDF document text
    • https://led7.ru/file/viletizoka.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/fekozexibuvaf.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/77669823126.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_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10884 bytes
SHA-256: 796b77f1f70273e74fda3ba98001d302ee64de93003f07e1d0cec60f14b1ba1e
font_01_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 18364 bytes
SHA-256: 4a5cbeab562d587a86be058f61ea0739b25e72481f58c34baa8a290ac10afeb4

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