Malicious PDF — malware analysis report

Static analysis result for SHA-256 5026bc24e1f592fc…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 15:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee5e9eeb337f1ced23539bf326451972 SHA-1: 81fba5b06cdfc84a7e67d610319faf7a67435c2a SHA-256: 5026bc24e1f592fc4c995ce8c01b9fb4dfb2d1b996af8c40942d62c174286116
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mikllc.mn/uploads/files/zaperafaraf.pdf In PDF document text
    • http://olynskiconstruction.com/pics/file/bewepufe.pdfIn PDF document text
    • http://intertribo.sk/files/mabofebukeparamobupax.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f7d062b80cbadb6f757480b861772075/xobonakusesosoxux.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/wepopilumamebowirobevore.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/25627954417.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/dekeg.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed83bb6ed1---vanomufabobakeri.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906112730.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/75298475882.pdfIn PDF document text
    • https://recrut.com/files/files/bodolurinoniz.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/vojowovaxomijamubu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bumug.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/91886005962.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/duteladu.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/85462000962.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • http://devison-matras.com/upload/file/44072954409.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79578383775.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303bff78f06---zamatemupamepuxigosabo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/bevutirenudirisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bleach+brave+souls+data+downloadPDF link annotation
    • https://lapdonline.org/file/gogevuninaxeraxev.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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10820 bytes
SHA-256: 28f4d7ac00385a3a80046bbf96b885bb9be6e9d25f75f171c793502ca790df32
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 15876 bytes
SHA-256: 2e247238bd5f8f331d37accaae2c0259792d41689506433f660a222da77efde5

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