Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b68b004ae773aab…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 03:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 400bdb98d9e2410556e2e91a5ec2a469 SHA-1: 03c8f8f31e9a6019ae1c4c4ee87dbb69c11646cf SHA-256: 2b68b004ae773aab3407317c69b98e5216168f95dbb3392ffb33be6cc1692b44
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://proxima-design.cz/files/file/25646564057.pdf In PDF document text
    • https://windsbs.biz/files/file/narazevopemanomixaxubuf.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/vabokulesa.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/gujasanalup.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4ce485b5---zufitagadaduwifo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae03f1f81---ludamezugumaxo.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/wejal.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/rifidurodalevafepo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/38311399517.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c3ee48015c5858e33abec3f22bc3e565/13524428454.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fc5550557a8c14f34ca47cf8cd5c1241/94441646261.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wezupofufejadivotubogaj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d429fb8b281---68490167822.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/xaxojopomodarogozeselulol.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611837da2cf2e---8499128084.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/pigujufitabotewezodof.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ace370625---87004930098.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2cb33200---94786861499.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/zobobojewafejefatepum.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021319434380.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/pabonevivazilixelamosodu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/35920856171.pdfIn PDF document text
    • https://laser123.com/geektic/files/jazosokononufemaxo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be55de0edc3---93072657342.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/tipetel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=qamar+iqbal+sufi+books+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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 10860 bytes
SHA-256: 38432e64b4f8bb62dbad66c445582a4051686f264639f369e604cdb9897bb3bb
font_02_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 17136 bytes
SHA-256: 8df70d0ae07539844e8b2eb6e7ba1d89c5db422ab7b688acdd0271627b5a58ea

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