Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e703e09a84219ac…

MALICIOUS

PDF

128.5 KB Created: 2021-09-08 09:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33a3f7b82864ff420fb2f901881161b2 SHA-1: 417a5f55cdaabb97d1f97b5545ad166af16761dc SHA-256: 6e703e09a84219acb6a7ae15b3d23939dc946498e148caf56524d0a2c95076cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous URLs on compromised domains points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6c8b5c08---mutopubebeguzipan.pdf In PDF document text
    • http://ttworld.hu/uploads/content_files/files/fosobotum.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3192bpt4sa67iup81uei3495ul/manit.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd9082a440---xoxexujivobo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe936cadbf---89772672747.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f8cf3dcd7e73f76e756a6ff0cfa57de3/lofovopo.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/fukomarudo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6cd02d605d648eb391686fbfeddbd1a5/nuxewewinipefasese.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/5578953492.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/95376362460.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/87238698925.pdfIn PDF document text
    • http://debden.org/userfiles/file/voweretuv.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/77316290026.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/babe536185c37d944897fdda7dae429e/64371692740.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vufupoxurabemavobo.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/h5375jp8qrb672aoqh68i2tsdn/28334911362.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jivamade.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/52584271106.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160920b935b7e0---rubowoxo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/46lp20re4qu1urvopnph43cvp5/sisideji.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b322b4cf2df---pixutif.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2cec7a3e6d3c7c2fdb34b6287e442f04/demakogedaxuziguximovexiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=oscar+wilde+pdf+downloadPDF 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_off00019294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19294 10628 bytes
SHA-256: 2f512adb6673fb5df28b52850bd5dde8a1149494cfdddcbe61dc64ce20fbb15f
font_01_sfnt_off0001ab08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB08 19096 bytes
SHA-256: c6dcd6f0b3f754398a568454bddeed329e0e0d75e5c15d0b6d2091d779a73774
font_02_sfnt_off0001dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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