Malicious PDF — malware analysis report

Static analysis result for SHA-256 465b3acea5890ec9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 05:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6ce1a2033dbd6a34e011ef9f2e17637 SHA-1: 9840c40212a6e0abb3e444df5b5975239f67190d SHA-256: 465b3acea5890ec94cf263c657249b5776f43ddec12f7c032db7636a2e7c6ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, such as 'smidgel.ru' and 'sindikat777.ru'. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=ookla+speed+test+mod+apk PDF link annotation
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/38543376698.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/20463136265.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b23066fc7---vodileturapefiti.pdfIn PDF document text
    • https://ikansambel.com/contents/files/papebotosisasodagefuwom.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/wagawok.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/44167497818.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ab437fe9---18898837633.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614159b25516d---rezaranafi.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/mubixujufumatisi.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/71435232247.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/64024160193.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161334f2937795---9034529308.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378960411fa---rojeselumuradumo.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/91276206505.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/kimekasixumanuwaparulefut.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/vofasawalisufu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/watotaposuwanokipen.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/47275858840.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/sovefexakuginu.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/61482724388.pdfIn PDF document text
    • http://turatabor.hu/media/jajasinurixakodumonirana.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/83b16e8414441d55b2d2c5dc8b90aec3/88768428719.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/salolu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1b588de3cd6192b70d9ff439205278dd/79235597742.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_off0000b82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 17356 bytes
SHA-256: 15a1cb8197a7211dbe30d388cb3cce9512bd3d05400116205039f697ff8b7e39
font_02_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10372 bytes
SHA-256: f4c77d2ddd78faf3e4a499919641df4b8493b3e85b69fc7d9bb0b166edac3492

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