Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92485d7df6b4cb7…

MALICIOUS

PDF

76.9 KB Created: 2021-10-11 02:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd7c4d769a8f5b34017356e00d670533 SHA-1: cadbe4fc008bae3c039fd426b2a38037adc03dc8 SHA-256: d92485d7df6b4cb771b94f39e7e2711fb26e836bbf0cede1b2e0f1a1a7a906f4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the use of disposable hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hidropomp2008.com/uploads/userfiles/file/ninamujemafadezarazob.pdf In PDF document text
    • http://mikomisushiwc.com/uploads/files/lawojasivozuposufatonawo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tuzebesekup.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/lamura.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/wadumilawegujona.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613573c6d108d---likobumik.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/98937510704.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/4741695147.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/90281718891.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f85e5d4c01---furafug.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/kalubesibe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219281027497756.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/50142349735.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/41864215904.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/12828301417.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/vewenalavorukame.pdfIn PDF document text
    • http://kesifveotesi.com/files/pimidikizimuguwov.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/vipufozika.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/buminobepakikuwapogejis.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/istkanvs38gkoarr4dpk4tf59f/kusipapigaxavenesa.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pezavebesepujedejixel.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/71160109242.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/7985871593.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210916_2FF4CD7EAA91B411.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/firuxapaxafazakedokofawuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=use+of+organic+chemistry+in+daily+lifePDF 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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 17152 bytes
SHA-256: fe2c00d1f2e48cf732123244b51ad9731d991e423043029dab67ca691fd1a2ee
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 11044 bytes
SHA-256: 52861c857beeca8994392ad6fb5f584c5894a56e58f1d23881983bcff00c8722