Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52cbacd5d24bb51…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 04:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04bfe325eb56850fafb73c00bc07d14e SHA-1: 8b196339870240c5e2148ff730b639a5d2722f02 SHA-256: f52cbacd5d24bb510643ceb27c17b689f83c96c6daf6b96263352a6b96972107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identify it as a link farm, with numerous URLs pointing to disposable hosting and potentially compromised CMS upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369cab98590---26279241775.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/652d99ae531aebc98e11bced934e6d58/labepasomuroxa.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/zoxepedemik.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/gezeveguxixazade.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906010927.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_18_53_11_8134.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/sifusaru.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8a996b17390fcabda52bd52dabe4c58c/rovevusuxew.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bonetimaxufof.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/gofupu.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/tekezudefasi.pdfIn PDF document text
    • https://kawanmto.info/contents/files/75773736130.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/27131841137.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/godanagufibomavuxu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fusovonaje.pdfIn PDF document text
    • http://www.grifin.sk/files/91949530360.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/kojifubomupadikov.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/bapusanulekisememosufu.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/velevurasanogezisujiger.pdfIn PDF document text
    • https://granitnet.hu/editor_up/nujoxafawosevosix.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/bereze.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wixeba.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/51843522476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+phylum+poriferaPDF 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_off0000b49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49B 10600 bytes
SHA-256: 59699bee2910f13485dc62f7a6809584482a1b0bf1e48e2f5d6ed8ea4fd5cd1f
font_01_sfnt_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 14820 bytes
SHA-256: 3262fe989e394867e09b2d8ac81ce6e910d583128f249dcb01b68bd33fc6ef9f