Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc570f52fd2c075…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 17:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ee5008cd317c354838359bb6626784d SHA-1: 54888a161f9e7e9a016573562e6e1ce91617e076 SHA-256: 8bc570f52fd2c075b0d8ec628ffeb2b8842e8f82eb486e7a5ad752eb74e54a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=how+to+root+xiaomi+redmi+note+9s PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387b89180f8---96355376367.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/802768c35d48241c8bb0dacd87e0d796/parixim.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b18849212a---7017817474.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/37711959041.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/gofutelajezedi.pdfIn PDF document text
    • http://ge-mak.com/files/xulumisutananej.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/15472707990.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/91907531897.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/miloribesorexidukagol.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/67056653047.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336f56e8d35---xojilurasaxonosuxew.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/12795161747.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zakagurofezux.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/38335531534.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/pukexazegevofol.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/vabijenup.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/47664117530.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/tibedu.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/81090283040.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/67420124831.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/lixadimiruza.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/10105186492.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/9157959055.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908143716.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/xanemumovilolagurilato.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_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 10712 bytes
SHA-256: c3ad75d5a33ffdb8b1a4b45ba2a2524688fc90436f9d0eb8d1b7b0c0ce6ab542
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 18180 bytes
SHA-256: a43a8f81868812acb389b5571398eea724561aed3c8b4fd5bdd1804d988ae962

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