Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c13b05802f567f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 07:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e3259b5241d755f948014af849e5b3d SHA-1: 5785586bf7985c4fb27042b9864bd4bc6b2ad8d2 SHA-256: c9c13b05802f567f894b1258a0bec00703b88fe07af5d0d8e1ee57ac4991508b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The PDF structure and embedded URLs suggest an attempt to exploit users through phishing or by serving further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://motivationandmomentum.net/ci/userfiles/files/zitorijukudowekake.pdf In PDF document text
    • https://alyosserspneed.com/userfiles/files/10198358069.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085820568484---mupizisubusuvebu.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/badivizilenowigagalufope.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/visinivivivomuzejoj.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a33a2a65bc92591483d293d2fb979064/kasimupibapesudekeka.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ae6baa3---74047439232.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a451c5dcfac---94245202976.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/59425358301.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://talleresjpg.es/img/file/detunibovokilon.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p2ted0am52rark3e5vfjk623bb/jekedelewaxiwi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/84elal9jkf4s7ndtprogkmb8u2/2382158364.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/81826616275.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/64787348422.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88adb92013---tijodona.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/dunodunadipewulofijiz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87dc77f06---relutezeketowutaselutiza.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/zifero.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/lagebowatev.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f825dbc002---56557611693.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c8e8b2c8---vorupov.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/16199981659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=demographic+changes+in+china+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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 10924 bytes
SHA-256: 926271ca478375b92f84238f789206a89cba835bb23dafff2a1fa7d5b902c958
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 17540 bytes
SHA-256: 71791895eec8133c66f4c8381424464eb8331197386a41fc4cf19b65cf0edae8

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