Malicious PDF — malware analysis report

Static analysis result for SHA-256 9025e06e664bb235…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ac369965b6a803e158e0f681f93fb37 SHA-1: 82afbb7af453474d1b4ef03927afa326fc5a8552 SHA-256: 9025e06e664bb235939670455e8b97fe05b00c5b3e4f4c46cab555eb283c477d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://nomylo.ru/uplcv?utm_term=wcc+lite+hack+mod+apk+download PDF link annotation
    • http://fitnessklub-impuls.pl/uploads/assets/file/tomiseriwewubofofagiti.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/97778863372.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/suwerejuluparuvuzo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372badb42fd---mubovegip.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/juruzigezos.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/35173603322.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6i3k3atlk40138nbh02gfijhpj/20434671090.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2fc1d1ee---2945213360.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/39978910945.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/17417380072.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/65259487068.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd50bf3c3---xevurupulukobeg.pdfIn PDF document text
    • https://pcetravel.com/files/file/29959164731.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/nisoromolajozemi.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/98904080515.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/kalemozime.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/xafexogisanigugabu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/265840c5d80ed67fe1552e1ba7c5784e/89372226342.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/23131443008.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/rugenose.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2593f94c8af1ae5bf2b87efa759b6c7d/xigepi.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32816598086.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/lilovivuloraberaraxuna.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ef48b1eb---xusawufiluxo.pdfIn PDF document text
    • 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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 10680 bytes
SHA-256: aa2522c1e1fef7c6486882cea8f89c6e6fa42ddc3a4c67f8f168e3429abcd18d
font_01_sfnt_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 17492 bytes
SHA-256: f53f68fd2bb93fdc0c7067e2673baf0f031dbb649aa061b7c0d30f7d56831cba
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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