Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ef69b0ac7e74f7…

MALICIOUS

PDF

83.1 KB Created: 2021-07-28 14:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f881db0c0a028be0a7a04eb5a3e22c78 SHA-1: 30fc712e09463b071ac4c703562e9ff72460707f SHA-256: d8ef69b0ac7e74f75d6ee22b682b6fc32c6e39a64ca3a203eec5f55c170c1899
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL targets are indicative of a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf8910706---31341710845.pdf In PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/92794143682.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6839a33b77---17685277408.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lanaralamarokilapadigi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607779b6e2ea4---3508247227.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/82592670403.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/fokiduz.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xudedagexerom.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096bd545b444---41056163918.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/56504323683.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8aa2f4ce247fe58c844cb6dc38545ed8/2339433876.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/torunibeji.pdfIn PDF document text
    • http://planbmedia.hu/files/rojazuxaw.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/jisuwunen.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fc447b971d7---60942843984.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/99023e3c2d5406c073402dbdb3f0d1be/30461094887.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kebalutoziriwinulejetizi.pdfIn PDF document text
    • http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/rupufuwi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/31144823807.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d095b52f5c6---julefojekikefawixudon.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f273bc44---90121509466.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xulavanupexuv.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f0216c1b---doferiwepilagomiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+alliteration+in+annabel+leePDF 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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 16388 bytes
SHA-256: 249cd571a7ea25471b1676276712fbb3d44d29872e4d087ecde83c8f0f40cc98
font_02_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 10340 bytes
SHA-256: bd3af1d0c5e2829d2d32d1adbaa1c2bbc6e5f02d5f75037103992a5b7d8b8377