Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a50dcebdc48ddb9…

MALICIOUS

PDF

101.6 KB Created: 2021-08-04 21:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc096393a35758e1c227467849cbccd6 SHA-1: bf06626985d2c5d521750b0d4786083ccaa4ae07 SHA-256: 3a50dcebdc48ddb9f4b502108daca4635cb7597fe2951c4252479ca3d65665a1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.001 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It impersonates Microsoft and contains multiple links, including one hosted on a compromised WordPress upload directory, designed to lure users to a credential phishing page. The document body is heavily obfuscated, preventing a detailed analysis of its specific scripting behavior, but the overall pattern strongly suggests a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+pass+your+texas+real+estate+exam.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ahreco.com/uploads/news_file/pirutagavulikufilakarir.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc828774c1---vapoga.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/rifivuzaruwopes.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/pivatikusisowumexogawu.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/lanesosulenusazutimawi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/625edbe7833ee5defbb81a3f601ff066/95354583324.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/bc1d6c56cd776f54dcf095461977f6cb/gipuxikurowuruvukege.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/67851647831.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/rabadapobulaxupotiwobabo.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/69544308316.pdfIn PDF document text
    • https://luminex.pl/upload/file/78308680067.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/nifonotebatuwuxesiwe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4d9d11d116c2e567d8fd6e108bf28e2f/38100194795.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f8efc6491e27745d0aa7aa98ef73c255/togukagagegutiduguvij.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/27175719404.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160db3724d0da1---puvageb.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vmthng1qvor6kl1v19d3eoo5kh/zajadomeleze.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/figalegovudibajutazodipum.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/porijavabuvupimatevulanoj.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/zuxevejo.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/83942653034.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/suzurune.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/28407936512.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/rulumaxavixone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+pass+your+texas+real+estate+examPDF 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_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 10612 bytes
SHA-256: febe9ea2bd672baac829d1a74a18706aabb4ff9f242cc7ef49e68fc02e9767dd
font_01_sfnt_off00014077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 17896 bytes
SHA-256: 043cb35cc61dd104b7fef6fee81f4bfca8a25adb158fc91493d53d8039a7db24
font_02_sfnt_off00016f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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