Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a98a72852d0bf9…

MALICIOUS

PDF

90.3 KB Created: 2021-09-08 01:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1deac57382beec3d10e0a9dd534b2e4 SHA-1: e552a4a9107816dfb4a17aa6dc92d28691b0e598 SHA-256: b8a98a72852d0bf9cf4390a10ce1ea752b02261593130d5f988843632b4d44b7
196 Risk Score

Malware Insights

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

The file is a PDF that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate malware installation or credential theft. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content. While no scripts were directly extracted, the nature of the lure and the presence of external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160927ab722afe---1385292555.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c530147d3da---52666205195.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94903f073---ruwixexetozovik.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xiginukirobize.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/8378327782.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/kijoxiruvizoxuwap.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/wikofufikixef.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc27d170e---56436026590.pdfIn PDF document text
    • http://lblussana.it/images/file/64228066680.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210818001249.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e25208aac---vikimani.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/sevezoganudovemugemopu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/6281979390.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d23b0278---tikugogisuragowelabo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b2c79031b40b774c058cb98d911cdc39/30558836554.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ea443efbdab6d67d9ffa88416fda4399/lujafodetatamemuzutoto.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/penajotala.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/62233638184.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/17248101256.pdfIn PDF document text
    • https://kawanmto.com/contents//files/25744520417.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161333aec512db---mawigevawe.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pubopezofululajorufomoxij.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf0416c20d---masanevejawogunima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comment+pivoter+document+pdfPDF 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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 18596 bytes
SHA-256: 2bd2f71c87518b0feda3d637394dc94f80e4c62771a69b8c89403cfbe6e6818a
font_01_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 10604 bytes
SHA-256: ffe6ba8288b139037f96826d318fe9e2da2976da5fc575d7018e7d8cb778f178
font_02_sfnt_off0001436f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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