Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c7bf192ebc5832…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 03:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2bbd549704271b70657234ab910c6fd SHA-1: 367833779451c75bc24ea7b65688ef78ed1a0293 SHA-256: 38c7bf192ebc5832be04a75ea2d03ecbc1fb435077a0a5ba6500b65d20760320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=santa+cattle+for+sale PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24f2c90cd65edb4c4405cd7cfe498684/fojab.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c95e4b05829d60a847cf965003acd1f6/bovofimigasuwow.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210529034621.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/xutigogo.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/52996847985.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7e3b5db7c4f4cb2c92637f95c8caa6f6/bowarozumomuwuwofeko.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2bmmbdc44uei8ikk1sa9m3mk69/rifonov.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e54356ac---meguzedafeligobajow.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae43a04638---vekogawozerewododipokarot.pdfIn PDF document text
    • https://cargobull.cz/res/file/segebaw.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/82159177498.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8230c1748---51049443515.pdfIn PDF document text
    • http://marymo.ru/uploads/files/rosuzinavatoxerokut.pdfIn PDF document text
    • https://htchninc.com/d/files/38621733745.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/52csovke91rjb1bsphjammdmmv/43450957091.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9b34faafdd41b9885a4987ae15794eb6/ronofowuduwadavifot.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e63e82c29---12410415344.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99c7935d2---66744909706.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/jafuto.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/nulupiwit.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gvkttgipavt0qs77pk418s63p9/60714016600.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd05547c2---xasabesoxebo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a828b8c785---puzegujuwexixudirerof.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jogonoxezojata.pdfIn PDF document text
    • http://rentaruedas.com/files/others/zarixokojegubisulitov.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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 10312 bytes
SHA-256: 4de2586d8509b427f15e919ae503f723df9f7464e560781ea23e041504b4ade1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 18804 bytes
SHA-256: 05d5b3c9ff3bc43fdf3d6e127f739f419bfb9c29a310366a25c4294ae1f8bb1a
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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