Malicious PDF — malware analysis report

Static analysis result for SHA-256 11580fbff80979e4…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 11:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7b28f9e2a25dce14ea93590cdb9f541 SHA-1: 91f54519c0eb38ee7f040456ce971f544b4eadf8 SHA-256: 11580fbff80979e45c7cdaf4e0105ce0da897f59da72b5bd706e1fdaabe694cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms, suggesting an attempt to distribute malicious content or engage in phishing. The presence of these links and the overall structure indicate a likely phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb2acf0a5---fagij.pdf
    • https://copab.tn/216mag.svn/uploads/files/kigisa.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/vajuxo.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210530193548.pdf
    • https://hssanesteban.cl/files/mamoluxuliwusatagop.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9d3h0gd3qiscphdq6f7kfo65u2/sezunoramowujew.pdf
    • http://fine-cottage.ru/userfiles/files/71156850786.pdf
    • http://dulichtantai.com/files/uploaded/files/7510221474.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r6q51b1mnf0scsgap3qm1gj725/riseg.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/74964368792.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9dadda96e---48240205919.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2343de6b447d6c6de5d9639abb80b6bf/43469703585.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609479c6d3f4a---27031321592.pdf
    • https://holocaustresearch.pl/nowy/photo/file/daret.pdf
    • http://language-coach.pl/uploads/files/boralasujenidu.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25528755371.pdf
    • http://ccsl.asia/files/daxiziwogazimorusozefito.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/sobusironerewa.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbf94e4f64---12999658243.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3276e64ebd---16764510843.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8df90f753---91377330495.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/39ne2end11urthmbop038m69j3/77430862616.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/50112875896.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b1ucsed93r1s9oqcvv8uqprm3a/75988338580.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+swap+a+automatic+transmission+for+a+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e585.bin
7a56efdce2c1dd67b6aa9eef8a44a520a68cafc2e8e6b747b7977e11dd1d84b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 17708 bytes
font_01_sfnt_off000113e5.bin
2bda2c90f11a415c1d9227fbc9ef7e8dd574dcd90ebd027005144003b411ed7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 10684 bytes
font_02_sfnt_off00012c67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C67 16792 bytes