Malicious PDF — malware analysis report

Static analysis result for SHA-256 c279959cb96131e6…

MALICIOUS

PDF

93.2 KB Created: 2021-07-27 15:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cfdcca1818863210c153d2b319af3cf SHA-1: 31879758304885edfca520f5866266cf92db9591 SHA-256: c279959cb96131e6dc62f258172e8dc0b6c3499c84799ba61f61a9a5595b7390
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://rencontres-icare.org/userfiles/file/83239868544.pdf In PDF document text
    • http://geoodwierty.pl/files/file/17275154510.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/sasadaw.pdfIn PDF document text
    • https://fishuntpesca.it/file/47859060734.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/zitapinatokikotexizufos.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/45ffr9clt1okjtbjqq92jvllo1/xuwalakebugojet.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e091e00cb0---budubopunewevumudatoze.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf65edf87---94530386426.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/3902341366.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1511761220740330e7a26520a685012f/19954535751.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6304722efb460c66e3143d28cc3abaf4/12338301580.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/11473647862.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e3e7cfbe---kupuf.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/javiviru.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/25104168803.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/977509bc10e409ffa67fcd040a143deb/8659561160.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/vuzinexoruf.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/45bfb8d7dd6ca9e8eea1a68d41e49e4f/35278458831.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zufebipaxilenitadu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4be00552487371f2097505953b2976dd/fipijeroxuligarujatepegot.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/bemoxonone.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b7afbbacc5e1c6b6ef708892d848796b/subitezuxifitotadulonu.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/wifoxotuzapivoduvatonuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+set+up+xfinity+wifi+passwordPDF 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_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 10840 bytes
SHA-256: 0d16b1cb0088f55d168f69f668dcedde1e68586664c609541fa59187481af328
font_02_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 17384 bytes
SHA-256: fc1ff78b4b1da1dc9741795439608ac55a1a99d37d72dfb0a41b5f5900e2a245

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