Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2407754e5b416a5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 07:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c3e1d3a7f4bfc0b0c03f3c5fdba0140 SHA-1: e0873d27a04b531e42e3378552d498e411c27bd2 SHA-256: c2407754e5b416a54b83f5e2deef7ae2cea6569c6506b67bd430f27c6f9e9f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=similarities+between+ios+and+android PDF link annotation
    • http://automotiveenergy.cz/userfiles/file/zukaxodapivor.pdfIn PDF document text
    • https://kawanmto.net/contents/files/ruwovawosol.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/reruzu.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/49817788190.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/fifekubekener.pdfIn PDF document text
    • http://airzo.net/userData/board/file/zuzekina.pdfIn PDF document text
    • https://miet.hu/kepek/92526729098.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/wekifoxozanesujipakizan.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/widonaxi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6606f178bca109b08083b0946f1b9fae/17959163971.pdfIn PDF document text
    • http://micruts.org/userfiles/file/44101899309.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/luwodofubibekebekukozot.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/200548195476.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/10489433960.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/16065260327.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147474c9cb07---govetimurolo.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/87553834016.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/soliwojun.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161454668737b7---52137208309.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/94856782275.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f2e93e3e2---gutavuwofugif.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/93206037381.pdfIn PDF document text
    • http://skupka23.ru/upload/m/25537890618.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sigapezewoke.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/gon092hgmkt5df0umied3qlbja/sojutax.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_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 17912 bytes
SHA-256: 128b205e0a617721a0bf0250c8803b125980073e65ffeb9f109ac98ff320aa7c
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10712 bytes
SHA-256: fb197a3dd5283204788aacc29ee40be7d5c8de489f5e7d10ce7c323da52de58e

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