Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1182ae0b43a8774…

MALICIOUS

PDF

97.2 KB Created: 2021-09-05 10:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c52bc382467ccf39ee89e7e336a3d6ef SHA-1: 1e6ed9cde0bd3b62037739e1ce8b43fd09f2839c SHA-256: d1182ae0b43a87747a01e48f476108fe4c460313aabd4511e6c2d93714c599a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69417efac---lusisomodolalejalaz.pdf In PDF document text
    • http://akinmedical.com/uploads/file/26452822880.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/94934472413.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fb95837b---nowikotopunowega.pdfIn PDF document text
    • https://mmszke.hu/files/file/mawagakimumixufozoboremi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/26487758725.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/31886253258.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ce520b36---73523109444.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94cd51948f---kogorupikarovebokabo.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/99181758755.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff7f19c15---domelegexisawometokimo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/vepuxixiw.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160944bd492c49---23404872349.pdfIn PDF document text
    • http://amandamaitland.com/images/file/92282348553.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f0378c7ca5883d9ce856add3a408dbe/wovunezen.pdfIn PDF document text
    • http://midospa.com/upload/files/62125487588.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/90301918462.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/16035906190.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f28d3940f---65103180923.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/89867123100.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/fubolexirurimipofipo.pdfIn PDF document text
    • http://attlas.center/userfiles/file/21516521663.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/mujipub.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gokezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=reflexology+massage+chart+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 11132 bytes
SHA-256: 0755c1c1167f1ec6b6142898649d1ed9815aca20f0d617a8f00d6e01434fbdaa
font_01_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D14 16160 bytes
SHA-256: 2fbdf737b51a6159955e4f33ab78abfb8d8d9146b84ce65752c2e1791934b141