Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2683395179ea8a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 15:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 656e92574520eba0f4001e96f9caf097 SHA-1: 65ede70b61d7735580a27023723fb58cf2e722dd SHA-256: 9b2683395179ea8a6e331a6359eb8ee8f29466c429f3b113bc40723aa0a779ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://maybomchuachay24h.com/Images_upload/files/54946800147.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160889c295e5ab---solofoporuvubu.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/79067066593.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/powupukozuveviriwiw.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/wirewom.pdfIn PDF document text
    • http://www.emailposte.com/pictures/xedepikigezewomixoxatedaf.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/6537643132.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d83ddcd4---wamizilo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0430bd91f4---zakepurewem.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e085fd30ef3116e72627cf871a1c26a6/wiwabirobibotiniwob.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/mogodexa.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/widurozuvepudu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d93787e64---kenevawowageferepe.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d115028b16dfade42dceb27126362e9b/43866936729.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/33653448982.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/xafikedizefukud.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/13396824917.pdfIn PDF document text
    • https://fototipia.hu/files/files/putepidatut.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/morovatos.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/41768589677.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dfdhn9ej1b3sof5003qg4065n1/29964935543.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c386b153113---nidube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=multiplying+and+dividing+fractions+worksheets+for+7th+gradePDF 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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 19480 bytes
SHA-256: 69f743e8f2e158f0ca374c575aa579e35d071f96a918170dee14609a8003c35c
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 11400 bytes
SHA-256: a38a2274756cdde532169b0b5596d7a67d18093b29959147b5591244c3b7ad37

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