Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc34dca70c8c820d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 06:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 707eee2f5b9751ffcb8449a9895eb691 SHA-1: 6eb7905b401eff5591adfdb5cc2f8a5336df9cae SHA-256: cc34dca70c8c820d4b568b426c129057f2e0af6ae32b98baac72c5d39c8c8c09
176 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS score, strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://huntic.ru/uplcv?utm_term=spanish+future+tense+worksheet+pdf PDF link annotation
    • http://brno-skoleni.cz/ckfinder/userfiles/files/wifisimutekunogovur.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/56997802517.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad864ba832---farixiwaki.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gasurifapedaveluf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cma46b9b0bemgksbvkebcrrg83/77077948262.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2ea0btllsu69epsqo04m4nmn25/55936470056.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/12817233347.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/pujete.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/27973633705.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/xiwufovakatidu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/57805476627.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/12912434399.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/58650243288.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/03fc7439957f646b1ee0afbb3e60e4b6/57003398739.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d945708f9f2---gajesuwagovopepebeza.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipugutusalojanit.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607afcfa0798e---xuxaja.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dmku8ftrcerrrh6cp4rr03cdc0/fegegizofikikadazevedege.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/9577440569.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hdhustl6hrroij464ok6uiva0v/88829735572.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/lilimipimamepowenigu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f3d9f21a72473038b20fbabd7d817e8f/34314092609.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/fajodupesizafuziwar.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pukapazomibukepedusoki.pdfIn PDF document text
    • 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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 18640 bytes
SHA-256: fba4aaabac7ce5c2b8e312dc185ac0e9991f4646b45c3229a73b05d17133616a
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10904 bytes
SHA-256: 91ffb5e2db829c084883ea2eb0cbfb258c1da94151e88a501079df3d175e9bb1

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