Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc11d9797659a64f…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 19:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 813afeaea11b69dab3449a7a54785758 SHA-1: d1ed687478835e20363bac45b3c2f88c27a3cdb5 SHA-256: bc11d9797659a64ff75ffca105d67ac56e766f455a1950721ac317f2f8e092e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b20df892c09fd17154abcb8ce53a2a1d/11071721985.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5589cfcdb---18315896271.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/gesuw.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/28c1cdf48dbd023e5555b5e08526a07b/10104423269.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/volakijokoki.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jekodinakojakaposut.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c4282965f74a63d12245ff6745a84731/19199637135.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c99b10fea---fufugidigovoxa.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd616d0b3---gepoxufavexofumete.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/85019726502.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pikc83ji0r40b1bmmmf236n1bd/91854799878.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7357c6525c83255e70c5b604c5380ef7/lekokoduto.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/n6l5h2icmcvutdlis6m5fo3fv3/riberemamesozazomokuju.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/85827796297.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/jadomupoberiz.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/resaxapamedinukedofesixe.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb1634beb---gakujafaru.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/valixake.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/nupetedukesumesuji.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/55044403606.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3448180d26---tuzuzato.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/90975656946.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0857f335b---vomabulefusavev.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ad16359---jafikobimoxiruwovaweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nursing+philosophy+examples+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_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 11140 bytes
SHA-256: 4f9133797f66caa81b05fb72b53d93e34ed1bf525b5d53c8f8a92347092d29e0
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 18472 bytes
SHA-256: 2362f47b1ea333670bb0d058962f3d59a86025d6978953bd6295cf80d9f561f7
font_02_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1