Malicious PDF — malware analysis report

Static analysis result for SHA-256 620708977f4d1ca6…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 22:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dadc02f93d9c81209008327c73c23db SHA-1: d8026822320acd15e37d11ed0f6a844de8dae529 SHA-256: 620708977f4d1ca6a63c3315c223dbc1a2c4ad3f7e17a620f1dff98f98074700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.olivier-frey.ch/user/web/file/dopogoberedekiribisobixun.pdf In PDF document text
    • https://vinacoma3.vn/userfiles/file/sijesekapirinapetabepexul.pdfIn PDF document text
    • http://teraval.cz/res/file/11759753877.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160daec833c108---22399158224.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9d80058b46a9f7bc1e99e66b97972d6c/ninugurupeni.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/newofafebazanufu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2953539f---bogivutanumukixigamegor.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/62619921136.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1014713f---fokafiwonepamivemupominok.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a9a825d486b50e87dc1196af68d1ab04/71483029188.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/jabubedobaxajukajivanub.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/45269260480.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/116c8b63869af79045f10cfcf89c5679/pujalureza.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/93180462395.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/bawezakoguvu.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/60846051140.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1307f00e4---36990217280.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/2ac1678e60250b5f59ea573ac598de1a/jafuriferagofugezo.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/219135251.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161043281ee945---22584313770.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/2a1a5fff456426ad24d274a07b6db842/fidabixivegowuge.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5df8cbdb71b1e03dbeb4e8e808671050/11349987452.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/95793805703.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2851f68d---nizopipugafenulinaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=teor%C3%ADa+y+dise%C3%B1o+organizacional+richard+daft+11+edici%C3%B3n+pdf+gratisPDF 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 18284 bytes
SHA-256: c51bf0aa1cddc6d54620f0fc3a3325a2891751f9a51b46f6ce41fb1f1cd8eb4b
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 11496 bytes
SHA-256: 43011614645a87344aada972d4fc8efcd00001a202afc800b62362667d27320b

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