Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba039398f4b19664…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 15:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b36e6dbe20eddce4b96c299ae3c4fe7e SHA-1: d22f891f7085d934c4ebcb0a43342a4422ff7640 SHA-256: ba039398f4b1966494e02ed6e6dd1025bf68cd0edf7c703627dea4b3d3ce7aaf
164 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a ClamAV signature, specifically 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to facilitate the download of a second-stage payload. The presence of 'utm_term' parameters in URLs suggests a phishing or SEO-driven lure, aiming to trick users into clicking disguised download links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=bsc+it+discrete+mathematics+pdf PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbb4f01c33---32615590713.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/6729451218.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/94768395190.pdfIn PDF document text
    • http://alltechsro.cz/files/goforakik.pdfIn PDF document text
    • https://wildnaturetravel.com/File/dobewadogepo.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/67455313614.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/kusuborawirevaradovaram.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///tifafobi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mibol.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6357162608.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/45490d7d026183f6b9da946e49059253/mezej.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/zejetekiwonodilajofexe.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/samud.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141dedfa5484---wotew.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/86273803066.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/10038877494.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/xojuwuraveg.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/9268170519.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210919022715.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/23fac7033706e8e10e1bf69fcd9935c9/rewajujaguzazodariku.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/matuf.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 17312 bytes
SHA-256: a5390318d3461a8727392ed97a3dada203ab29d2d3ebdd38e1af47c746558951
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10668 bytes
SHA-256: 7b9e892c0e7362cf5e92c66bb70c38b77e10ecc8173b4aeb30c0059f35c6ec48
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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