Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e8c7828c5ab67…

MALICIOUS

PDF

136.0 KB Created: 2021-09-04 19:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc73580f9dd9ef42374730102023b403 SHA-1: a90ca08f3d1b70b006dd2cb75c3b7b1dae7a2a15 SHA-256: 284e8c7828c5ab67600ae676069af3e481709bf48846a317abd367b8ce077176
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various compromised websites, likely for SEO poisoning or to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://torbay.ru/images/uploads/file/93700838426.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c6fe8596fbe9282bd4f079704a2529d5/85797530339.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/71768724368.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b6b287f6---pasezivomiruxepa.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/99237329557.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/92283078726.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a01c996086b5d33fc9691fdeb880108/2780092540.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb953c64503---77163953680.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/88mnh8iha5jqk4fh3dajoqh8p8/14054764138.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210723_55CA8016F5155826.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/90325986002.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/botli0j7kkasp8p7k773b6qj34/toxivojikibewedoj.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/wefiwesebopudesepawet.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/kiwarugib.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/62723534007.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2113be9e2---82944894440.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qghkac3ddrdn8j4f7g3dmq9osr/jeruropetikixazidirap.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cd43f6dbf77e26babbf111bcf2cbfc9a/vogarojutigadub.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/42013090644.pdfIn PDF document text
    • http://hasyo.net/files/file/65309364528.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/kakogasukuzaditewopa.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93175774055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=garmin+striker+4+instruction+manualPDF 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://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_off0001b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE0 19776 bytes
SHA-256: 7eb37d790069a8655d84aa03dc10f9222c3a3a5fdaff8fda29e8223899339103
font_02_sfnt_off0001feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEBA 10700 bytes
SHA-256: 8ef49d489f433e9574c9c0341ca978c5f254867dc828712e5ce9d537a8735ad7

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