Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e8b2db5f17b912…

MALICIOUS

PDF

100.9 KB Created: 2021-07-03 18:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da6783c40939b6d71e0ce6272da4639c SHA-1: ba03720d9322073b3e883043eafd97eb2c7e6165 SHA-256: d8e8b2db5f17b912f5d9112660803107c9e9affd3a72064f9ed24ae257652395
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV, indicating it likely contains a malicious payload. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The malformed stream length heuristic also indicates potential exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4839

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • 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=the+slope+of+a+flat+line+is+undefined PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c03fb020805---8936637603.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e76af78b---ralubapokekusimezipuda.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zewiwexofebipezewodili.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/puwubavuvarijofuzegexudo.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wuxozu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3db686a53b9ae2046d6e640394cb2f4/zajikip.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///susosesofipuse.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/26870361606.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de827ac8df---51764219218.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/gm10oh03ep33d5dpi9snp9med7/42118379981.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088552e3a14f---90739615320.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/lojimifimuredepununatiba.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/bobuxaxowedemefewugaxej.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c8b47af0---petopazipizibadatixisuno.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1ad1a2b11029a15348a07bf10b8a4e29/13496331870.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99442a1c90---rubalubetidofikapax.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9a7597ee---39531894354.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f253a30fb0---42127144244.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/fewalerekuka.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5798b4c7---66416291468.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0e205b36a---xibufuxusegodejiriroliwi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/71717861780.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e287015a---mukojiw.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/fofemanabijubemamigev.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb642c4259---sasafexirobokababov.pdfIn 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_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_01_sfnt_off00013f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15772 10560 bytes
SHA-256: 8daf987e1fc060e752fd45e07e496f689272dd8c8bb7128834b28cbac0d2695f

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