Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf6ee4344910ac7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 04:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5513206c9256609789b5e440ec085b76 SHA-1: 899b0c70fe2271b4869db8447a6e146945523bc2 SHA-256: 6bf6ee4344910ac7ffd9c2777a15cdbe5eab3a3b416ef11cc17c57d1a55f19fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URI links and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tpokebar.com/uploads/files/76376250470.pdf In PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rozufovamopowigosomo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358f5883f5a---kovifujekepaditobewogiw.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajakekakagifedad.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109180017597059.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161416215ba364---5476335355.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/67110530129.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/vamofurusomevime.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/solijogalexejiruvoxirep.pdfIn PDF document text
    • https://hobbypet.cz/files/file/wenezegikeloxelitam.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/91626895792.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/vumukowuvulibafaduzij.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rozusefisifililibexevezu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350d2971823---32338602578.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/60563372526.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/69761768887.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/jibog.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/puvagadetofuv.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/90986165103.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/84522282524.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335e77f30d1---32156271268.pdfIn PDF document text
    • https://magerp.org/upload/files/24120680067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sonic+cd+android+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/wezarejugunalu.pdfIn PDF document text
    • 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_off0000c2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E1 17188 bytes
SHA-256: 435d518619624969d82d3efb95669794045232ecfa073bc5a695b96bc013cd6a
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 10128 bytes
SHA-256: cbb1c1f7ee481a6b44fea4848f19099bf63ebdb2e46c4f1e32bb82b5af1bf8fa

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