Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7de24bdf04b6f2…

MALICIOUS

PDF

95.4 KB Created: 2021-06-28 21:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f217ce550d3e90a6213886ee0832f54a SHA-1: f16d1acdd1eca62e30e0f481326b38f1b543144b SHA-256: ac7de24bdf04b6f2ef3bfdfe3feff3862c81eab6f7dd36301bb532d77a3ed981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lead users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lmdf2vl3ds3ihg6mame8bs96n2/lufafinirarutudale.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-30/20210530165241351219.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/83064f7527a51dbaf6e30ba3aefc3689/55943483956.pdfIn PDF document text
    • http://gtshotel.it/images/file/tigasamowe.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ecaa8162---tojusamadaxavij.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcdb31d79---72402957276.pdfIn PDF document text
    • http://bakoca.hu/files/file/92162071260.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a2d430d9---24131357207.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb08d052bcd---fobavuja.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad821d77f27---48819081182.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/29563426669.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fit1i9ctfrophf5m4p9gkh0bg5/84630481882.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/wumevuwes.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/a8n9glpqf4l9910b92597iekf3/kizilazolaxupakoma.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/puduwuvusutibogisireso.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fa51cf537362f6933b1234528991a262/50457055874.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a169e7e6---96373827035.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/matug.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/nogusod.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ded61a53---mogemowolotujuxiwete.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/srv9jarv8thejvldagvkjhv8q9/rarivozeremupujuwoxu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cnhbo28nf65djc62brrl161bnd/58712889077.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608835fab6bbf---40344749147.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nubakikaxasuxodubanel.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l4kp322lhqmvlo45d44m8ue6q1/7396129844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jester+medieval+timesPDF 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_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 19216 bytes
SHA-256: bc6bc8a4e23b444c3a5474c6855477d61dd021bc0078e40497e51d37401ecf3e
font_01_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 10240 bytes
SHA-256: ecded68ae56fabf6e520b97eb08a736ade4811bd59ef93d26db27b3a5f4c40b5
font_02_sfnt_off0001585d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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