Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea74b906412a84ed…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 23:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 340ef2d8fc14266adb5343838bdb3666 SHA-1: 47297cc1e1cc56b0a70c2d61f5dcd0af39af9e62 SHA-256: ea74b906412a84ed73259bd1abccb99bd271d20bfdc564a109a01f04bba341be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, some hosted on compromised CMS uploads and disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a tactic to distribute malicious content or phish users by leveraging seemingly legitimate or compromised websites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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 http://bischofs-scheune.de/userfiles/file/84946050172.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e78bf7d9---ledemojuleresutiti.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/99512947020.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/46358314206.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec9f25f3d3---pigikitetam.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161182e7d1e607---xesomako.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/guvorikuzaxus.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kibavis.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/kerede.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ludununibobukove.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/80285943232.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/nipakafa.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/difefumifolumeduvejuputi.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/gosedogubawefuzeg.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098de38eb2cf---38363166898.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/17652355188.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608855f305a16---62076528988.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/43aa4da10d4929c9b5cbb53ddbf9b81d/vapajilaziru.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/52156095439.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b769bad397ea839bb5f7cf04d8e345a8/10001858542.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41658401896.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0fef771fbf6948bd97bceee3c301e9a4/14613034382.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b362d350b8e---1766606894.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/24920315412.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f8210b60a---41141180170.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/92171142807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=all+caste+list+in+tamilnadu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 10644 bytes
SHA-256: 2f944981d26b0a8203cc39050a2c58807072f929e6c7327bb6e47f9161344624
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 17968 bytes
SHA-256: 512aa0dae697c799b2f3952e6873d1cf6ae1bbbff1db55f77cadfc7fead542fe
font_03_sfnt_off00014378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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