Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a71ead6d1b2dba…

MALICIOUS

PDF

115.2 KB Created: 2021-06-28 03:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ee464cc730511f774661db8dcb74e16 SHA-1: 2964f498a11bf2ca91e473b442e6b813de7de728 SHA-256: 23a71ead6d1b2dbabf42c61298a09b2b3f2d3f7ed8c4778c32644e164eb1db5e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. 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 suspicious score 0.4454

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://oniceh.ru/uplcv?utm_term=nationality+and+statelessness+under+international+law PDF link annotation
    • http://meteosputnik.ru/userfiles/file/rezewotaguravunigukivakas.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e583b741a5---28553092704.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d39d9cfae---kidezifalik.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/24442187644.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/100aiegvgllkp6p0k5k5hpb1j5/27587504453.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d066904218b---52013068407.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/76356881851.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6ec7284ad639d91f6cf720226723c6ab/85620162607.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/majonufogunepavak.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083561db42c4---talafavupatoz.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/jomip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce10d0e8d4b---mazodawevekepabox.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7fefb49d3b9240f8024e1b71db3381f1/24668572438.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6e6c3c36---noxomufodo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/938e2c617360f17b78d5292c5c81d67b/xumazozulaxivunigix.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4011e7d5e527574ebe3d2b918972e58/99127102842.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f465fbed08def367c7569316b1bcd54/13442144296.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t5llh7pd0ks40l1ils4pej0a11/lelovudupemaxijasefoz.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mbaece6k1016apvvn3fkf2msf7/11556163140.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0bcaecf99004c97a7e700401ae24a260/65286563230.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_224116_149.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/gugamitu.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_off00017126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17126 10520 bytes
SHA-256: cefbadfb149cb054047f58136045dcbfa0e67c7ff3f960e2f8d8887ce5968690
font_01_sfnt_off0001894e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894E 18072 bytes
SHA-256: 691e68719aa1e0e0650b0606c386796f625f3272444808e3b5603d53f4dafdec
font_02_sfnt_off0001b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1