Malicious PDF — malware analysis report

Static analysis result for SHA-256 003b56a9bc9b32c1…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 11:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7856a43523ba3bb9a73f02ad32ef1d99 SHA-1: acc0c6528b6cc777f2ecb3a859c94cd3075af9a9 SHA-256: 003b56a9bc9b32c12b9aec7887d7d7e1ff9aa1dc9b5bd1087baa9af679ee934f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=types+of+electromagnetic+waves+pdf PDF link annotation
    • http://ekolojikweb.net/upld/userfiles/file/9129117159.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a0c6548b2dc688ad484fbfb906c59695/xorebujofasofuz.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/bizubupomuv.pdfIn PDF document text
    • http://dnepropress.net/files/file/15393286215.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/tetapesodigiji.pdfIn PDF document text
    • https://loctra.net/userfiles/file/82508325618.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ck2lrvs023e1rbo5hcmjgpnk1b/99194537411.pdfIn PDF document text
    • https://naves.cz/res/file/katikimuwal.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9257347bb0993eb76bd6c1c22c8a6f69/74318131753.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/kinejofoluzojataw.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9385bb3b1daa63cd77b6b1beb998a802/tapowuvalowozotuma.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/dazonanimopataleku.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e0987efec0d4684f043ac9c7b6a3e9c1/pazuj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b028d7238---wobasufulewon.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4fcc2b21---zilijelare.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/pusuzibubodegofiripo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a996f6a67ac---4487753326.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f2986ef31b56747a8d5fe5f3161a5a8b/57876849401.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ca85c439d3c102449ba58852a0dd943f/73959931883.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vadok.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160727fa95809d---bonisalivozuxa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607698c318a00---57138465649.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/23330482258.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xusipemunotegolomigo.pdfIn PDF document text
    • https://stopserv.ru/files/file/dibuwovedajikadidezobovu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/30049621059.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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 17976 bytes
SHA-256: 8c281149d8b4f02ef697e028772e1b1a7e8171ed2d0c6618f7c5cb3629736c29
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 11192 bytes
SHA-256: 3afe47d31b4d8f3a0e9f95321bf95574b0c6c42200898740d9e2cb0b6ea24394