Malicious PDF — malware analysis report

Static analysis result for SHA-256 8958909274d47f19…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 17:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a2ed4dae9f03ebe4b49d4b564bf773f SHA-1: a1a402e815a4c22398f72ff3773962d049afe286 SHA-256: 8958909274d47f1988d0ea42db524eacc86c9fa65b9b651e5c6e7ff414d198cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://floresdeserrezuela.com/aym_image/files/kumipelinanamodulut.pdf In PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/15122169372.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/32545738538.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/fopunixudama.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/mujugimibiluvudupowe.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/wavuninekubovusaraxirejin.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109140553035077.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_6E831640700A8429.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/gugemopijowuneg.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/16597197928.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16319029446386.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/66120481641.pdfIn PDF document text
    • https://akvaguru.hu/user/file/5196817054.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mubomop.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/48015705170.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed353f2ca5---71455276076.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/91962116398.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/kawiko.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/jatabosazexel.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mivogevonesata.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0525abce9d4034d2d858aa005fdfc740/79508154971.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zubezaregale.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/14689968107.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/53329182013.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614819ba07ace---37377860890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+dual+messenger+whatsappPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10884 bytes
SHA-256: 14e32a1fa1473e0d2caa14d42731adb23990ef3b329cf67143dcb979f0baa83b
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 19616 bytes
SHA-256: a10b261c241225c75138b24bd90f4e07a7c5e7fdcd036eec1b47682c56c83132