Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f6f3828d5d183b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12321350f60104fcce6929f598b0b77a SHA-1: 9a40ec4d4ae08665102d05c84794dfab6d65ffd6 SHA-256: 56f6f3828d5d183b50fd79567054d623babf4d1f4aa0a1f0d52d7551dea63a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, specifically targeting upload directories, which is a common technique for hosting malicious content. The presence of numerous links suggests an attempt to distribute malware or conduct phishing attacks by directing users to potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/1l7ln0l0kaq5cfkoqrsdom6bk9/86342813985.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6b141a01---7183442236.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8nf0u1s74f9nij9i5pg7ttdsgb/28756882811.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/66vm0jiijq451e1pisnp166tm6/55977677063.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/xapazowanexil.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/gh721pc8h1t3cqv030fq89d9q9/zubapo.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/dorejilemabu.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/11724262814.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118606c502c6---57752604969.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/pafogovalawasizazada.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c689c880a9c---36874289640.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/432d746a9bc3fa7edbf2880b10f3a24b/92099468799.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a5c07e25ae786b577d709455ba9d9b34/33484046754.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/43096b3ec3d42bd38e422dad1dd2b02d/fixipetikamerapovusa.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/lebipazimosen.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/38aa6b89fa5c15368bb6f8d52caf9d20/nitetiwesimigofodibimav.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910c9ed4f25---69338581917.pdfIn PDF document text
    • http://enewind.com/pliki/file/80772958840.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2d65cd83b1b834d2e16f3181898b8946/54098572913.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/40767557135.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/74452524536.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/xowesovolubon.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586352b0a0---64803620683.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/abfb9630dbbe732c247d2c374a27f7ad/saken.pdfIn PDF document text
    • https://seerupit.dk/assens/file/68864478682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=jurnal+formulasi+lilin+aromaterapi+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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 10748 bytes
SHA-256: c15e0ab4d249f16a08f14b6ec8693e3b28c208046b097d6b2dcc624576f40db5
font_01_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 17108 bytes
SHA-256: 20876811090b341158177e34d66cbb0d35c5c888ea5e45c9de0add587fe30cb2
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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