Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac865430961e722e…

MALICIOUS

PDF

119.2 KB Created: 2021-09-01 09:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 213adb09aa5610dddf982058ff7f1b08 SHA-1: 09047925ca7d2287c10bb41570b8b4638bf47dbf SHA-256: ac865430961e722e8c4637e506df5e3c66fc940a88985eab930c9e5e598b2dfd
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c2da412ace1e2d335f15c7ad7d9a19d7/55756243579.pdf In PDF document text
    • http://korean-school.hu/hangul/userfiles/file/mekoxusejugutuvego.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/koradavonetarojikoloxuxa.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/jazegeperawefavukase.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d230a95c---14411304913.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778096bbea5---zaburejudujaxef.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30206b44d---tebudanudefa.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/welaneti.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4cc19eea---42706279774.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8c4b6633f82fe58f15d835f92c158a4a/banejavat.pdfIn PDF document text
    • http://dentherapia.hu/files/file/75413036606.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/19776387430.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/47860095951.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/detiwawojamupadawurarag.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/pemapidefipexijifituleb.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/90940318912.pdfIn PDF document text
    • http://devison-matras.com/upload/file/pumatixedeperanorinefeki.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fphcljuljaas65n3cai79gedpm/65593178522.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d30a72f6---dexafeg.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4cff16cb---51305805180.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/85288148005.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/dobokokipavebamuxela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+definition+of+cultural+relativismPDF 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_off00016a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18247 20080 bytes
SHA-256: a21670be38d8ad3fc72a4de87d6fcf9a145e6a6cfdde292901cbcb0cd5111dd4
font_02_sfnt_off0001b66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B66D 10900 bytes
SHA-256: 7833f4ce769b1f92e292895ee1c43b66055be6a8558f3e531fa1ddc5e7bd468b

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