Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1ca39da997c2d1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 15:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95b37dd589968229b83ce9a9da34bc8b SHA-1: 9abac8c9176260ebf9025bc844ede6093a8326db SHA-256: 5a1ca39da997c2d147b961fa9d25a275010f2235e165b97bd2d82ae6743804b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=hacked+bad+piggies PDF link annotation
    • http://teknis.it/userfiles/files/50691828505.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/95288191645.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/foreleza.pdfIn PDF document text
    • http://arucax.am/user_images/file/kumununivazorob.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/60837602096.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/xufetotojusorufo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/57181141392.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339be06f973---40061475421.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7a6357502e79e2deea9f1d659460ac28/11725827744.pdfIn PDF document text
    • http://fitviewer.com/files/file/84535523683.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/dewazobevufajenobumo.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/winozeg.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/jefobitizis.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/gidifafawelijisopufujazo.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/28228042037.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2d04ccd---23677916232.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/nuvopelepijej.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/sevamosaxalaja.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/12744961.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/54405833091.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631307916.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5b0d127f185af07320bb822bc92983e3/fakid.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da926cd2d6---seripir.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m0dgv6kmot4r264qo7knn2up44/luzogenibetidoxa.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_off0000b6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 15804 bytes
SHA-256: 1fc00b81ad491c7a6ce2504274c7cebcc44e7d6c0d188a2b994f1412a047013b
font_02_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10444 bytes
SHA-256: 23015cdcf052ecc3ae552d2578daf17f7d0c47563e98945104332c31109e842f

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