Malicious PDF — malware analysis report

Static analysis result for SHA-256 16427f18dc7fd8fd…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 11:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a981035083f17872202cec2ea0b6d2f4 SHA-1: 476e2d4f20c6d2dbe84393fb435dd8b5646388cd SHA-256: 16427f18dc7fd8fd05d61348ec199a3e3fc16391c40a1d124803839d084d5230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=bengali+alphabets+in+english+pdf PDF link annotation
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d2d8bfd5946ed13723f3669a066f20cd/56514185983.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7cf938465---gukiragefaxuver.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/18387839702.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/maruxelikilotizuralovuko.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/63775947184.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4d04246dc---purupusidefikafogakogoz.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/33759530230.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/teveriwivo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae4164b3c---39126560939.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd2868ee---51242781356.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60D74EEEC819B.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608382a80dff8---xoxusurepakumev.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9d4245a8---gagokajopamevolo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/00d0b1042175c441262bb9dcf9ba401a/fugejutu.pdfIn PDF document text
    • http://fabtur.ru/upload/files/64412997916.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/88777002018.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/14615826769.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/29243757973.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/junejafogowezoda.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d74083d40cd357e694ea04b74dd55e54/86845225036.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/43499168495.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddbf89f13---82460460537.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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 18888 bytes
SHA-256: 197a9fcc617b8f41ccdc716092886f501734bf6fd2d8e940b59ad59d5241feba
font_01_sfnt_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 10752 bytes
SHA-256: 8661598ecd3433de2547bdace3f34aa458e9fc725df20f98ebcdc098995ed434
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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