Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cfb82606aaa022…

MALICIOUS

PDF

91.9 KB Created: 2021-07-08 17:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: adf5c994184a2ca88c97df4265d87d4b SHA-1: 7acc6a873e34b349d92be1b5770e268aa6923625 SHA-256: b3cfb82606aaa022187887e8c229e7b639b4f2aedde75cc0aa868d8ca62cf7c8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba334095ffe---15698844760.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0538712e---90446867518.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/rekejimetobizajador.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845195cede---22286413054.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/gosovurerefidaruj.pdfIn PDF document text
    • https://robertbah.si/files/file/61997303351.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608924d94d64e---vuvefapegowevureforu.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/9025839865.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ff5c5a1c93a713639c4cf20234ed3d3f/15922873213.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/xozajolugaliwi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed4ad5412---kidevozutesuzijunupine.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26868adf8---88836515040.pdfIn PDF document text
    • http://abpaluso.com/upload/file/53869454647.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf03e012c---vewemofejidedegeza.pdfIn PDF document text
    • https://steammining.com/userfiles/file/lezujuj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a98beea445d2d42ed07f4920bfa6be2c/vokewolulakipo.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/powepakunizajadiluba.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/xitetinewebevut.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zexuzilomagagodowajubif.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607398d6c9d61---bafevupogulidir.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc180224f1---74051735962.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fewepukelu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lg7j24ude9mhcpfi8m4o56bq85/wawevusemuvonexijigawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+world+america+madePDF 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_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 16904 bytes
SHA-256: 9ffd4262380ed4dd2ee59c0a396d6583315af462facb99c38850ce90b8867b03
font_01_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 10316 bytes
SHA-256: 94812dacb7ef75c017b45888415a275e7657b1aad6cf078fc4b2ea7f6d8852e8

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