Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7137c4fcae78f6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 02:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c259b84863c688849cb63a25f970f7d5 SHA-1: a65d4a7c5a85278b05783a59f8c98f1bb4d67952 SHA-256: ab7137c4fcae78f62f708a8674a98ccbf671a643bda520c57be961a8335c4d08
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the nature of the links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://infrive.ru/uplcv?utm_term=estructura+celular+bacteriana+pdf PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f16d4513e---pawajagazifunu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ccf6c355---zapasakabemobijatik.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dff723f6bfcfd5eea5518477f920f693/dowupu.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/56440907108.pdfIn PDF document text
    • https://lasanisports.com/files/xobasozitemejek.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c0d20a9f---biwin.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe69678a4---45162498093.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nflfuvevn11fcmnpl9h0cf80pj/8664285580.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/zijuwalopo.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/34051224976.pdfIn PDF document text
    • http://air-con.ru/upload/files/12598223501.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9c39lh3msphf0810ujcqp0g9cb/46911101543.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/govimegene.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/88675560688.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2a196e5d---gepubiximifewutopededa.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/betawezavosuwetuvisubojir.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kabuza.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/49f49b2d82463d463a3668ed974f777a/fafaregagexur.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1fc41fb9bf91bc44b1d0414653e62c21/25271565495.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/momowizuzok.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/mebamedomurowivawowas.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jutuvokomovutus.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 18192 bytes
SHA-256: 01342722c4ef95cb4c1d63c47f8131a1fc9bf701a683a983d527768e5f165c40
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1