Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12bf804b5420b3d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 11:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7247b5bb280880e28f76ff1fc30404cc SHA-1: 9f4637477563f4edc7bca300768cd03afdb710b7 SHA-256: c12bf804b5420b3ded8f77f93b9bc42d66670611459e90a9bc3b7bd54dc0be24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the true destination. The presence of embedded URLs and the PDF structure strongly suggest this document is designed to lure users into clicking malicious links, likely to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://emeraldcovepartners.com/_data/images/file/62453608872.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137195b19119---83223617477.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/96516779644.pdfIn PDF document text
    • https://asiapharma.la/files/files/57092698326.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/luwelija.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vomaxaruxuze.pdfIn PDF document text
    • http://edeins.com/userfiles/file/dimobiduzetitojop.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/83246100728.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51f8b02f0---xaliminudefexopezes.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/vifozovates.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/36583741966.pdfIn PDF document text
    • http://salwex.hu/file/bofuredukepogi.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/daruzalevigo.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/270134567.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/40329785844.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mijit.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jevadulibexowubasoxojope.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/23422287492.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/74365600636.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/jodutasolomibepopaw.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/tewelinozuladib.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9573382b---bevozezilizod.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/povitiremukagawogamutig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+tv+essential+appsPDF 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_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 10432 bytes
SHA-256: 154e61c4b70a656b1ed9b4ac62aa39d747d94c25a3cf04c4886770f6ed13775d
font_01_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16520 bytes
SHA-256: 8ea47cb40e6e667f82aab463a5a0a90db642a3d552e59ae1b0ee6718325981d8