Malicious PDF — malware analysis report

Static analysis result for SHA-256 287c0b7537a243a3…

MALICIOUS

PDF

93.0 KB Created: 2021-08-14 18:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d79de0c6057442346f6ab4024137eaf SHA-1: 79f8dfbc5917a1c812542cb71c93c091ffbeceda SHA-256: 287c0b7537a243a30e66f9a88017e0ae13ed8dc18957616f66e7ab83a3fd95d4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links indicate an attempt to exploit users through deceptive content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc310a9969---45938749447.pdf In PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf1226fd41---67763350058.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/pusaditujudejavuxiwi.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/40584450267.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e68f422da---rukimeluxerixag.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/57620941565.pdfIn PDF document text
    • http://newo.ru/files/files/88193521877.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161032a4317a56---40729540377.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/lusopiwekamurojawipan.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/23041897869.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/69547465793.pdfIn PDF document text
    • https://emmaushuis.org/pages/83632482841.pdfIn PDF document text
    • http://accronline.com/userfiles/file/faloferem.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/96833850660.pdfIn PDF document text
    • http://prosquash.by/data/zuvusigivixiwobanuxilewok.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a738188076---xogiwisiwev.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/80b287f5a1dc7bbf0d0cc26ebafe8d01/98786322777.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/823999687.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca8c91c8a---jovopuna.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jddl851lrdk59and72u3jt00l1/belatagaxeronamubevusux.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/75636305011.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zeburakofafebazabufixudi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nijt3110f5c6v3ucpbcum4ggn5/lefesolizadati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=exerc%C3%ADcios+sobre+reg%C3%AAncia+verbal+ensino+m%C3%A9dio+com+gabaritoPDF 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_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 11380 bytes
SHA-256: 7436e0f32605ba4574c5202087995353c4a5ea7880cbf93423aa460a27ccdcdb
font_01_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 19884 bytes
SHA-256: e0a2310f46cf058dd386e72ae32bcfbd8e004313c4fa5bd9aaa15df702a45310