Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bba7f4d44d128b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 15:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9033f43813876c5a6991186af56c52a1 SHA-1: e834bc3177ad43ae480d37b33f1714aea1c98ab6 SHA-256: d2bba7f4d44d128bfb59e7de462beaae69ab72ced02772e26dbad70d280fbc54
196 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'Fake CAPTCHA' heuristic indicates the document's primary goal is to deceive the user into performing an action, likely to download or execute a secondary payload. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://archism.ru/uplcv?utm_term=fortnite+vb+generator PDF link annotation
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146ba4d708e2---zodunop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000e5b1c85---53968694343.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/41774934372.pdfIn PDF document text
    • http://bushurov.ru/images/files/51220320092.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/daxapifexefot.pdfIn PDF document text
    • http://webbuilders.com/files/file/26197024367.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemijorijuf.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e881802b032f71291dfe399430bc78c9/turumexaz.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/pakitosolevu.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/83421061311.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109150937592497.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/botalagazurokotigege.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/81346632462.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/42299949684.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/gilogaki.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc8cc9c97---56714896314.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/poxegejut.pdfIn PDF document text
    • https://bloc-immo.com/images/wiput.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22588857257.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d76d9a58ae6a89900f521e95dc8f3f7c/vumemoxizavezorutilure.pdfIn PDF document text
    • http://djpress.pl/Image/files/28840917300.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 20332 bytes
SHA-256: e49a3411595b21bae671194a1bf2b9728f421e490a95cde2378e1a1358f2f6c0
font_01_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 10252 bytes
SHA-256: cb8cafa65b84ea654da5671e56115925a50f305572acdc28c556b9f7c52ac15d

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