Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c201454f3d5fec5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 16:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 077ac2fdf0277bd7656e5ac24962ec51 SHA-1: 7be13056f4d6d082659ae7fc56665e6488a3d10b SHA-256: 4c201454f3d5fec515bc326c54cfd682d29d4fde2faa37a3b00263ebdd208feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are identified as compromised CMS uploads. The heuristic firings indicate that the PDF is part of a link farm, likely intended to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15f36d9924---38257504585.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1b49145ed---27704954751.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7225e4ea686cab9e0c81eb5cf0dc41e7/45484548658.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/93371065764.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/57341190424.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16128ff1c9a1d4---rebarazip.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/77996858346.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37869588c2---wejawedivusirulovakud.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/33205116398.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/xetelodopiva.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/67195625709.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3693a02820---jetemo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726404b6dca---96668712396.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/86103567658.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b601809c7---59269418360.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/67865991736.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd4144280---nesesofikewopifalezibonez.pdfIn PDF document text
    • https://activepymes.com/pub/file/56570227376.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/mavulub.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0v8so4bdng9jqrsr3a00j38kui/69901068772.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9675b55f87042ff2602f9c30fed4cb74/77306202080.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nopaxeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=brave+new+world+read+pdfPDF link annotation
    • 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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 16836 bytes
SHA-256: 26609deba62bc3f18799463cdd022dca14d4a084dc481b598f623829e9d804ce
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 10340 bytes
SHA-256: bf77e361b2a77fcd53e7ebadea4a1be356c92d13e53b43a94d52e84a872b8080

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