Malicious PDF — malware analysis report

Static analysis result for SHA-256 11de6f294bae6aff…

MALICIOUS

PDF

101.5 KB Created: 2021-07-31 02:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46a39bdb8f864f005a146c5375187a6d SHA-1: e7bf113874f3259c616e8ee41aa6b23aa6adc384 SHA-256: 11de6f294bae6aff4c62a77657d2ddda46b5ea085b188770c2f3f0b21b46ec0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://infrive.ru/uplcv?utm_term=sony+shark+tank+mexico+capitulos+completos PDF link annotation
    • http://aarogyamedico.com/userfiles/file/84647786523.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e11411862---rawaresilefag.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607084a5e1e90---24950545879.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/38818458248.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d205bd8c4---muxero.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/12010560045.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/72468769495.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7d9ea6ba87ed1f999655adc2bf1dbfe2/dawesilogasedegos.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9e0086086dc5a9a7c429e8d525a3cdf6/kemaj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mt53fkbklijkl8ha3h1lhmn415/xugobakiwowedun.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160847f38a35d0---pazefukeveketa.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050113541419.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/kiwonirenilozupuxeg.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160845c4b735f8---76165567797.pdfIn PDF document text
    • http://dnepropress.net/files/file/4771790270.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/63534508611.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/zemasagep.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608adcb73a24d---duzesokexakimaja.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/37254817633.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/laweterulilixajadezi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/be7ee93a24c8dc8aa63aa405de9399b3/70930656862.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/21840216085.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fa16c56d---88729226665.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zusotinafuniwelezinod.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/48300540237.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbed95e32bd---17360858758.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_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 11124 bytes
SHA-256: 8e8483553ceabd53189b13b9db35c5cbbe17ca4b682237d1ec45a34cb9118441
font_01_sfnt_off00013c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1D 18792 bytes
SHA-256: f0dbcff105d0f531965c8f2f68c65c0bce41648c2ade6b7eed3685592ed1a88c
font_02_sfnt_off00016c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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