Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09c716aeca83e0f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 04:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bf9a2f3826345f80196862436b76982 SHA-1: e65395633e2c8f3e6d70182f35c02c20866a58b4 SHA-256: d09c716aeca83e0f84c066bf5f428561749514fe0e25239f40b684e1f8a2bd90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document's content is designed to trick the user into clicking a link or calling a number, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/987f74a13a6f5664dd9ffc3b452e47f1/zivelizorifuvurelafeme.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614660b82b330---xigolisukoburoxavorejo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2651a8ba---26817542065.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bozakurefakafogexolasol.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/bamonuroxogiwikawumurik.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0ab76396fdadf330a8567203f055b47f/xupoj.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c2edcdbceebf22e5e5c5c90184f910cb/21058306403.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5c01378---tiginexufewininovov.pdfIn PDF document text
    • https://mlspoland.co/files/file/fajojunesojevev.pdfIn PDF document text
    • http://aa-nusd.jp/81130123197.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/liwedefavogob.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/bovudofuwasonikumubi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zuzametalapunosiwapexobi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109080804513225335hrjsl.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ltfdt7num8pnju6nom7mf6dsb0/10716885215.pdfIn PDF document text
    • http://endobible.com/userfiles/file/45146242428.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/76520241615.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/9406494080.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97014627003.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7728b3e59---42423615965.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210902_E901559149D16950.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/95736913711.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/kikomuripinubigabuwo.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/xutuzutekewigowukid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=smart+view+app+apkPDF 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_off0000b63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63A 15708 bytes
SHA-256: 712198d46c061bb31ff5c24c5a21554d73bbcc971971504dbbe39017bac250fb
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 10292 bytes
SHA-256: bfcd34fee6555a1031d315d17609e6726f712e5149de7bead97a765157c6aecd
font_02_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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