Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5a656ada5bd09f…

MALICIOUS

PDF

82.8 KB Created: 2021-08-17 10:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ff5b70dc3268d3780632443a089660bf SHA-1: ab94282fe357873e6d94d0f546b5dd3e1640aa88 SHA-256: 5b5a656ada5bd09f4cfc48fc4ca9140a27c428dc51115b67cfafc9e90e1a9275
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61576501488.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/chp1n2ejsjjjfhit6237p5abc5/94470143981.pdfIn PDF document text
    • https://aromamarketing.md/img/files/gudakuteripurodazafuno.pdfIn PDF document text
    • http://farashimirooz.com/files/sezipemuz.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75949312771.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/42396919470.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd48c7ac35---82596036964.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/dddbf316108e0fc7bf3108526e319ec4/butafunonokejakanuguzusak.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a7a6749ae---40422295953.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8ee41aa4b0a59ef841ab5e77b7c346c2/kopotikifuxiralubijil.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/40294552089.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/36217956035.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742f81276b1---fiwidilibuvuseda.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/vofazuwupi.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/kotonekerepebaxe.pdfIn PDF document text
    • https://akemi.ro/hirek/file/58300818121.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/nifuvozes.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ed6f5451c8710b3042f45137aad14e91/2613589832.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81264346116.pdfIn PDF document text
    • https://bdata.vn/upload/files/85515969739.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/xebol.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a04c1dd277b0b54cc272f42cd10f17a0/12209484620.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/vigejojalune.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/mumexanafomatuxadol.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/wamoxobivisulit.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/47703392247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=como+hacer+una+division+de+4+cifras+paso+a+pasoPDF 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 11016 bytes
SHA-256: a05696e8bca4f097f5b706b19cef407740342e79a9a8e2000ed1b88af7045bee
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 17264 bytes
SHA-256: e1a534dac26084354c4824e83548918b56a68b19cbdb2eacfeaf99f3c201eaf8
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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