Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8512f5372e4c28e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 07:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccfa00e36041c4f271454fe910aa5f24 SHA-1: 311cf579ccbb466d1f865ef22864040fee1bb1af SHA-256: f8512f5372e4c28ebf886b4616b9d55a7b971edd85e0cd29e802647aad4ef1d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful sites.

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://catamma.ru/uplcv?utm_term=how+to+use+rmc+android+call+recorder PDF link annotation
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/xiwoniben.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109160207521036.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/99227778954.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/fovivazumito.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/84019392610.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/81535155466.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/pamepinupuzeretemal.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f06245d817ded24a7d0aeb2b49ac788d/wudexinimukibuf.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/67367099817.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/20222604005.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/warote.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/sevuvugemegomanolimifum.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h2hv4j4cl1p53qo6mlcsfql5t3/79943548374.pdfIn PDF document text
    • http://m2m2design.com/userfiles/88461243628.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/62476943338.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ume62c3iqgragak1ed5nhn1c2a/17567824318.pdfIn PDF document text
    • http://pk.mo/userfiles/file/73899729581.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/puxesumiridexobon.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913021517.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/11454080663.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/fezariloti.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/13677043402.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/53218635523.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nibux.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dojavifafu.pdfIn PDF document text
    • http://tdbm.vn/upload/files/64682519017.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_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 18008 bytes
SHA-256: 1f85f3f8587049620d03ea6e4228bb7577eb3b38c6a85b2d08064257cba5b166
font_01_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 10708 bytes
SHA-256: 2165f29d4e5125b157c43a84b8651067749dff65e7aaab5d6aa3fa2cb2fa5bcc
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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