Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbc084244e65d54…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 16:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b55e6ba3716754f3b37b48f4a70f176 SHA-1: 30e2f1b5ebe8d441d62297cb6f7e99e6d5d01562 SHA-256: fcbc084244e65d54e597bb0ed786b9cde99b4e5c72da2b190f32ac0769c5c97a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards a common pattern of luring users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=usb+tethering+windows+10+download PDF link annotation
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/31618767419.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/68703521344.pdfIn PDF document text
    • https://webrobogo.hu/kepek/73959396286.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/13240108235.pdfIn PDF document text
    • https://granitnet.hu/editor_up/37082132607.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/tetenozelalawolegat.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/tiposita.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146b38ccdfe3---61096541996.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/vegipevu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/48854610402.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/44043995729.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/perivopelupojo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2807608b47eb2767e51eaae11daa0fab/maxujovelom.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/meretiverofulabulazo.pdfIn PDF document text
    • https://sainaudit.mn/File/73419726252.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/85113515735.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/52444947856.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/83212046943.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/26949859218.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bipixatenimadozavedeb.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/17e625076f143d2c896d8120bff9d708/kaxusulujegawomazade.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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 10932 bytes
SHA-256: 1fe9f47fd3a94e78a3efc930f7dfb97290f6640bcae7aa95205e6b2b5676e19e
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16484 bytes
SHA-256: 3f3aa3e0bca7a8e2931a8d6a9cfa3e897c42218d09f389210d10e258a075f0e8

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