Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65e3f9708946163…

MALICIOUS

PDF

92.7 KB Created: 2021-10-07 12:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1f612eb4a3ccbcb5a2c82898904cf0f8 SHA-1: 64bf245f306b8ba4bccb9f02f86d53dd745192fd SHA-256: c65e3f9708946163663f6d586b09fa0e8f96c60374f1ab723a87b2e952b58e1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these redirected links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://drafthe.ru/uplcv?utm_term=the+amazing+world+of+gumball+final PDF link annotation
    • https://medicabg.com/uploads/wysiwyg/files/rubufi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/23830252822.pdfIn PDF document text
    • https://soechi.id/userfiles/file/18535490932.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/xevafarumusodu.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/lipunulonunujomuwojuwegu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/74523770568.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/megatosixulegaxalod.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/364867ed706d465708fdfbb8239da737/3312800708.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/tonafowa.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/20414044647.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/99939761320.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615954682d81e---kuvutuvuzazikifemetaxakis.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/pifufuzuxixezaxixogimupov.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355e0c6a7e2---37568911572.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/12952385221.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/63733691840.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/84869241878.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/75334684645.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/rugafasom.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8uif5c10jdvmsfa17ftvc00u53/suzapobowexikuzitojesemo.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/89789229765.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vapenifagul.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/fewevidanogesisewonilizir.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_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10884 bytes
SHA-256: 2955092ad2b995a06ff6f3a2db63aac614e1f3d957086153162ffbc2b001fe0e
font_01_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 20968 bytes
SHA-256: 3b1bdb6f5640fae227d983b93216bf39f243567f386a217beabde657a8fbe480
font_02_sfnt_off00014d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1