Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2ca325b70f3a4b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 05:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16ee16ab5596156cc4a6d1cd177355f1 SHA-1: a35342412731e69956a9f43aaf7b7aa3fc0d541f SHA-256: cb2ca325b70f3a4b621435d0a202c9fc71b7134064b3206e9a9dccdde3ff1da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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://wastran.ru/uplcv?utm_term=kumamoto+tourist+map+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/41mfn5r7t1n81hqpvttdpv7uih/dunutuzejupobezutuxugora.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/1382787151.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607953a9ae72d---wasuzuzaku.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xugigikepixasoduriraxe.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/65550800454.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd67dfc66---nukoneliloluwinibevamoz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sq00pn9gopt8a1qgo47acsup0k/sarow.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7ab4f41bd8eb8581edc1ebf9a357c8e/lubazuxufun.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/82767176330.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/newuxamajaxev.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/kazanofavabibuxu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ipsjh39cjppmjq81q6e004fqm/bodapibukef.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9k8cj1rafcii82uq0sblbi9nuv/rubulumugul.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a087832e695---virosuzuririjire.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/65250759259.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161247de7ce6d4---97696151104.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88f2da898---goxalegom.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/79824543740.pdfIn PDF document text
    • https://tmtteks.com/files/58686566185.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9566fbfe---56465560180.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/85003224927.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/kojumoto.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c823e3bcdc---39524602313.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_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 18724 bytes
SHA-256: c918475ce6560ac8b7fbb9b81466a7335d6919707d17b374adab8c2370c668a8
font_02_sfnt_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 10468 bytes
SHA-256: 4957a92649a9bbc014cd02e76956d3c39439db6021f0e25765c4e2b2523ec2ec

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