Malicious PDF — malware analysis report

Static analysis result for SHA-256 667dc7b2338206e4…

MALICIOUS

PDF

85.7 KB Created: 2021-08-30 11:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d668e2d67e75150f6ae64f458426acc SHA-1: 9b8c5b0c20f8bd0987db0b9b625d1e15e02e5543 SHA-256: 667dc7b2338206e4ee641f6da60a5dc74a4df5d045b317ea0b2a923b1527f302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs that point to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, rather than delivering content directly within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=attack+on+titan+season+1+watch+for+free PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/n1gccga2gnu2e58ooneshhmfg2/60559590351.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2678c1338---rofajibilujadi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/nexapofag.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075cae09bc72---xotokivi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/nak60c4fel9ku1ku85i9bt0jle/22367443701.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dab422aaf---weligeduniwovusazobu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d8e061b265a116f4f52679ade17b1563/26210089072.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gatesuduroma.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/44hu0us5932lub4sjbme661ffh/delurodenapo.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/99193239681.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/fexexevar.pdfIn PDF document text
    • http://saimiri.name/upload/file/fuwez.pdfIn PDF document text
    • http://arslanemlak.com/E/file/jomuretibawadele.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec1fd92ab---6192953148.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/43415804675.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/sutupajovufota.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/88331691308.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e13fd3cabb36f4b324ab8fecc7ca0d88/pafitoderapisire.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/9341b54d525204297000b6dfb70afcf1/25201504922.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d69e27c9c---47023268479.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a43279710---19678173369.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480fc2c94d---vivovenudonirevelo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907d8d4fa6e---nufaturelomojon.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/kuxugonufupe.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cd27b66b572d750bd781901fd28db669/livapepudukamag.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608018d5891c8---71970344257.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_off0000e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10596 bytes
SHA-256: b5b51d80ea57156a8edac623ab1cafdbdbd37633f0fc2267eb7e8a8b300f0417
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 19440 bytes
SHA-256: 3195be7a1538cc104e81fd0c58b13ba6543a0b3759bcea1233e72eff5b334850

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