Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90226ae090a85dc…

MALICIOUS

PDF

81.5 KB Created: 2021-08-16 13:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ca10db6bfeb647eb43497f41c46f180 SHA-1: d5913a9631aaa193174df18817f9ced0c8bbf8bf SHA-256: a90226ae090a85dc0f90e1e0c2c387681fc185287d2e4e23c67a085100416904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qolqtdomi9f8k0sutts4ksnt83/vebigalepewagab.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/72014410144.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/45263980264.pdfIn PDF document text
    • https://aksusu.com/upload/files/988169201.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/57242320687.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/36720842994.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/47285029163.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/47097015016.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086503bd5018---45380785436.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/92422583485.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bio0ib5tp5mq4jc1khkbbm88e1/18515806625.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826718cec9f---zokiwu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b285cc0d88f---65729621371.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/46137517090.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f94159dadd1---wawexav.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4dc3b585d---92057509686.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gakitaxo.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/96668526719.pdfIn PDF document text
    • http://envigest.cz/upload/file/23484310078.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/jerukubewevifunig.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8d161b00d915d90623b1f9b96986a3e7/sifazusow.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/lupugazari.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/tanodeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+4+digit+code+on+schlage+keypad+door+lockPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 11152 bytes
SHA-256: dc9dc171fcba7f2e023dfd94812dce606803424a6b6d27cd2a1bd5eabfa9cb4d
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 17676 bytes
SHA-256: a09feb5558bdab17c5dfa7c39424883fc9b01c6bee1a9e424762ba2454b1bfde

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