Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71d0b8ca3e9608a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-24 06:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f67c2aa09210ad6dbaa9af17c87f2be6 SHA-1: f250b7300dcab3d777f271e8700461199b0041a6 SHA-256: c71d0b8ca3e9608a1b7f876ac69bfe3db1a2196f061928d35be2514c6bce7b12
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by multiple heuristics for malicious content, including a fake CAPTCHA prompt. It also hosts numerous links on disposable domains, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into executing further malicious code or visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bluebossa.pl/files/file/puxumupalotezitadonuris.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/22161302088.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/volipaziviwitelaz.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tudobozun.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/76112886471.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/vukudeboroladekanowo.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/modamasezogalokepewozun.pdfIn PDF document text
    • https://unaizahic.com/Files/files/kufisuso.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4fdb5b748---55402245281.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45fb1d036---xaxokuleno.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pabonabowodepe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2aa1a7085---pevugowomirogojikewigep.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/mozape.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/zegut.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/bebavenekunusovivizakife.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/gedibimubopopiwef.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/degeseviru.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/2665359411.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/44818938017.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/15422985175.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/60029106743.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109020609259705.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/99272203002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+fake+phone+numberPDF 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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 10764 bytes
SHA-256: ed2e204637e92d4587624f2289c024c2c0a2549555fac47152853e415a626ec7
font_02_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 17348 bytes
SHA-256: 583ae8eb74f62bc962721255862b172e0e8de0f4858d4685bb36cfd3fa690f82

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