Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1b4fdb50fe52eb…

MALICIOUS

PDF

90.3 KB Created: 2021-09-03 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a211bfdbb52526f4017b821dc93a1900 SHA-1: 2cd9225f6a60df5580e539ae45e3d0f4310d12cc SHA-256: 5a1b4fdb50fe52eb4da13b68c5a6dc5dc7192221bd1d7b9e4a6c3a7058d21101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/14315444f116b0a662b5af83dbaa3c59/41884200596.pdf In PDF document text
    • https://motelandratecuci.ro/userfiles/file/paziwosekewinabez.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kujaxenogi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/juzironoloped.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/df475d3efbb3bd7b92cb9d5acf5f434a/12335404842.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db80da1ff6---dabedixumedis.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526200712.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a85bc5b99---53442227934.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6d75c772e724639cadf7e66352b24313/finoxavuxotawuwafidul.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5db60134c2783b61a99117c90e1fb812/44001797885.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/29520485288.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609c734f8f2d4---nirejepujipusebibexo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/33606524810.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/mabogejowegovelavazizuz.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b70f989640c63d33dca082e09888fab5/58339208621.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/77108397899.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/57988304579.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6401cc1871d74d18dcb680ba4f0c4dac/44634883041.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/21416647005.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/vukamobe.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9645e60d---74934701598.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036054b2b4b---54285836913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=animal+farm+character+chart+pdfPDF 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_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 10580 bytes
SHA-256: 4cd634fa6a9615f3fcb4c8ec6f33fae5ce917234a4494b3fa938de7457e27ab1
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 17788 bytes
SHA-256: 4a3c14e6be216439a3172bbe472881781b31c256d2967efcf67e1bd05e689b7b

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