Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb28d2809e13091…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 17:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e624b38439db52ee07683a0ce013905e SHA-1: 60e64b8b35cd9904c13128c1d1913e4f555c33de SHA-256: 4cb28d2809e1309132d973342c750eb9c6c62eba53cf3db8961299312542c8a5
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised websites, likely serving as a lure for phishing or malware distribution. The PDF structure and numerous external links suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58f8622ad3e3317ff79ebac38f0d49f1/fejotefapusubewijigar.pdf In PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/pigav.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/finilenivojefimasakekevax.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f1cf876eac00cec54b77983f41b14be9/58757132320.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7b7e99cce3a96b9e5b024838b1807b56/luziwuvufal.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f87c94c5cc593d92b7c31d52fc4d2d3a/18221533941.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xakujimiwis.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/xinuf.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/98b035f2e4ba7266a778b8ccef8e1e8c/sefewuf.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/sipebakatotemi.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/23386850686.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7e310438---vefulenu.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/zikapudafolokutufuzox.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8ec626ea5---dunerepakiduj.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/zawuvesosene.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/tenunifujofowaxadiseb.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vumepipewav.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021080816450170554.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d66b2960---mokesowe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e63f6851b---zutusepil.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/87302570902.pdfIn PDF document text
    • http://dytac.hk/userfiles/35938852600.pdfIn PDF document text
    • https://hiroyoung.com/data/files/sibuguxibesimovase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=como+hacer+un+alambique+casero+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 19848 bytes
SHA-256: 25b4e6a94443be0ac6cb8e201e1170b726e8bfe362af2727d72676a8977c5fdd
font_01_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 11204 bytes
SHA-256: 94b2450a6ccc5b5af6c59d021a5a8e348814bafce41859443e65dcd789bfd2ad

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