Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76f5e5d32630946…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 13:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c0b29ef9b59f7b25ed41e92c69ab135 SHA-1: 9bb9b407e9de186afe57771f9e3fe78c4d919714 SHA-256: e76f5e5d326309463d48e3fcdb46bd98b5207054aa92d69133ddf496b07ef863
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm intended to redirect users. The presence of external URI heuristics and the ML classification strongly indicate a malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rockyhotelsgroup.com/uploaded/files/vinowi.pdf In PDF document text
    • https://n-zvuk.ru/upload/file/60224344066.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/61242e0f94e9ee0b6c2b7e0e8e3817bd/68316651741.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/fubuwigetikopi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea2ab0594d8711db31b490023a408496/35309371041.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/rusolegaxopilujavam.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b1cd75a9931eab254fda952c0c6a7aa6/refogaboxizezopadabexo.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/fasazesudujususez.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b5ac39fa8acaae2c16fb3e5cd5d58740/2906959163.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f2238fab23fd27fb83c8ddf5c29f3931/63382035613.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8a143e326da7875fce13b30a5428154a/zetip.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210729214940087.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/56207bb4df7b2de24b5bfce6bbd70e38/82923758970.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117cafa31a90---60744318765.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/18550821709.pdfIn PDF document text
    • http://kaies.net/upfiles/2107170122045588589ggucm.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/mupuvunotobum.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5defe63a5---51106260125.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zutawulitixutoxitamo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d7ebbc7553f64d6a12915e9ba0b10bc4/zezezuri.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/33734034406.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/jeledobuvavel.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0ef4d187d---44053786980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=metaphysics+pdf+free+downloadPDF 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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 18008 bytes
SHA-256: ae027d10bd1909e2ea7a952434e44abb1e1fa85795085a29a5951607a18d12c9
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 10908 bytes
SHA-256: 7bad6f52b315d76d0089696b9dd36bf4d6acd92b6e5002e78b6f1dd5241b1f5a

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