Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e92faffeb96bae…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 03:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7e3193e14785c0173e14e94f6ea4e82 SHA-1: 2e865e5667c57db04ea8c53b5f668adc9328877e SHA-256: 69e92faffeb96baebe59babf6f8738bfeabbca1cd74958eb1f5cde33e5215e55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=i+chickened+out', are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=i+chickened+out PDF link annotation
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d9085659---zutaxesudum.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/tajazorigixutejoxorisu.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/48344897344.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gatefikaxosodob.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/79946244952.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lakukeruguxajul.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33794778753.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/583e0574e8fabd84af8e2c7e72e8596e/fuvetebavimavasoremapoxe.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/kevikonepabatax.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/31484363511.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112aebfb4da7---81423060780.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/reves.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/69111652024.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2df759f47bb72337c6e8645bdd54d18e/fizuzizokinudi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a76b797ce---naredopasakugimewujum.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b023ab9de6cbfd06c20a7d828672c4f7/najedo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608660d7b4b03---33213188465.pdfIn PDF document text
    • http://allasclub.com/campannas/file/guxuwikafuzenozu.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xamugumixob.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080685485858---9286713156.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1vefvm8fbq2tmrvmrqdfmovdd5/rukowefajuzef.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607197642002d---75928505151.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/berosuvamatepin.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10132 bytes
SHA-256: 3247cbd89456faba497325b8acff4caddff2f093c007fdc1e10d4288cee4b6fe
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17240 bytes
SHA-256: 86c9c63689a00f07c9621765aa7635f40c221ffb51800c85efcde7fe7f1576cb
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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