Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccbbdc4f51797b0…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 05:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cc72634fc0126a6b08d3cfb9182ac0a SHA-1: 12bd7e7a31c35883663ee11bae212c7c205f42f7 SHA-256: cccbbdc4f51797b02649509d608fdcf51cb26d5192f06aea4b69c06fb3a35363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple potentially compromised websites, suggesting it is used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38795280250.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/zevebobesekejito.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/76310356252.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/50808504349.pdfIn PDF document text
    • http://myredm.ru/uploads/file/48808512877.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9cf93c41d6f80849281dc5e4e08d60ab/dobubajewutomenujefufasil.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af4a70c27---33615300783.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ee34b40db29eafca0339e9ec9993b1f1/nodariwojime.pdfIn PDF document text
    • http://artospace.com/pics/file/85326347482.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/71282735452.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f7ca2eb9---putukejarigokekonaforeviz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c737e9167---pivuvutanopamu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/35745586614.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/32044728620.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608024486725f---46808021912.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/papalamujezen.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbc3bb7ea2---vajudolizowudabekudepexa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad02ae6c---xanomabi.pdfIn PDF document text
    • https://htchninc.com/d/files/61652086745.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/pasavegejarujesa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/673a301bd4e5e1599a7473accaa2d60c/27435250071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+to+dwg+bluebeamPDF 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_off0000bc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 10560 bytes
SHA-256: 6150e56dc1b01a8f648cb3ca8c2e710d0df9879254fb1ffd31bd3e458ee78e21
font_02_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 16788 bytes
SHA-256: 3c29b965a8362ff4aa1f9546f077bda63c5e9894446ec950a6ee561062c3475a

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