Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc61be0e7f719ca…

MALICIOUS

PDF

84.2 KB Created: 2021-07-16 13:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc10a15c922a2fc39db3f8761f87bf89 SHA-1: f1b45022cffda4195d0f68dc2777311572a5f1c8 SHA-256: 6bc61be0e7f719ca405a3f8a1b84a1c57ef94d46f08a407219d7e5d298c2a4c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://smidgel.ru/uplcv?utm_term=the+lion+guard+the+bite+of+kenge PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2e0e5c93---surukaxejaponuges.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/33d3d3c3a9ff9b2fcfef3889e3d81426/45026294881.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9fc6aab5017240c4bd897c14f89a2d43/bunikokexujudagagu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d9f08ec1---359531636.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/42097938501.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4ece8aeb---16469581662.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/69772178926.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db9e6b209---65893591555.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794f9875af8---21788539719.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/92841380155.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wugewebedage.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8819955eb3---37525258468.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d95e11aa11a8fb9c8a1d98611d7b22cf/81580823596.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4c7b4dce---luzesilezelimofob.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fosud.pdfIn PDF document text
    • http://sns.hu/_user/file/velediluwabivekoxaw.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2699a6087f49eeae739b016e7e4cd567/80818893821.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a5k9653oknr7ddlm9pk6se7un0/39420609485.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ndqi69j8ehk662h1tip9ajjgu3/88406011257.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://coluer.ir/documents/file/22604044171.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 18996 bytes
SHA-256: 9144e346465a32ce28d27b3a5d2ed6dec80a539eb3a39b419745f984846bcfb9
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 18412 bytes
SHA-256: ada6c4ccd10e0d47c0616ed39cc5175ae5fc1af0333dbf5ae4e7bf490402ed18
font_02_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 10760 bytes
SHA-256: 40ba5977ddaa45150a749ff5755cf2cc4975ab1c24f102672b711d35370b7917
font_03_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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