Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f75a6befdf108d…

MALICIOUS

PDF

93.7 KB Created: 2021-07-01 20:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 394944080a741b2452ac5d1f1d447b72 SHA-1: 521af1fde9a127456de9ecb61f37ab58ee3ac1f0 SHA-256: 13f75a6befdf108d0069e5d61f728befbff6e9c26e8f80bb85a17e79dcd351fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The presence of multiple URLs hosted on potentially compromised CMS platforms suggests an attempt to distribute malicious content or phish for credentials under the guise of legitimate services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cac39cbe12f---83794784740.pdf In PDF document text
    • http://alexhofford.com/temp/files/file/73780420976.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/45225447486.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b7458a77---93590685190.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b953c84d7e---74392256464.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/902e002b6969076159f612e99d6cf6a2/81381545331.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bf2150c7---42304364784.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/97745015284.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a153d9b7beb---58219617574.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714dfe7b364---76003514389.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507072413.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tsr9elv0csj7smlgrdh8jdp8vn/11556115345.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ab69b6fe---gapinela.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda75ec82f---xupimudajaruvipikanu.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/49254240976.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b17adb551d6f54f083efb40d667d4384/65910160211.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/98e10f734cb764a97453b0191325b531/zulidavazusube.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83512019e---jowixapigo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/2529354305.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/00a9ff69bd1cf5bbe7ece2ebe3419ffc/37794624919.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/42099339970.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/075468187a9e6cbb9bd861c490d497a7/zeraxanam.pdfIn PDF document text
    • http://yuha.be/_files/file/wabujoduxufajuzoxinane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=canada+immigration+application+form+samplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 18988 bytes
SHA-256: 1cf0aa940b793d01dc5523526ada227208efdb97a66e239f4d7b128af704b049
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 10996 bytes
SHA-256: e1af7a8e33056712e5d73b3fe84f54dd449ccedb8f743c5c8572df7b0b4ffd8b
font_03_sfnt_off00015074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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