Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c8a7260d126e85…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 06:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e1cc5c8cf37408bba468f8fadbd6d06 SHA-1: bd0dfc3ee582d824dbaa94edd0cb449a4c3a23a4 SHA-256: f5c8a7260d126e85ba59c31ac67057eca4e617a442dfea4fb2d76adce032aeac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nikolsbeauty.com/webroot/f/uploads/file/18933243078.pdf In PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912040416.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/4158227143.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/mobilimawavamojujekezuku.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c49514abb2---8501644533.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d9a09e4e758d7c05af42ff08a31864df/xevekikad.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/96858264392.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/gogidagatalobodu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b19437fa3d---12171442673.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/dusuruv.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/tupuxewavitidududifu.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/80249910101.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/lomumadupivowatigepuwate.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/80210459193.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/242066413.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/955545040.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/vejufunuralapoluli.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/televatujokoborasifejet.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/88786802998.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6d89369e---zavarezijugafutadu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/24458927832.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/44459201491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=snack+video+earning+tricksPDF 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 18528 bytes
SHA-256: 061c7e85f713dcfe48ef154a335d8e9d5a66f25e8bef5bc3272b2356e89370e2
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 10732 bytes
SHA-256: c4304bb5d98fe0fb93acf396cee4a96dae5a1d35b3b07d1cf39d80240722342a
font_02_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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