Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44cf5db20d449cb…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 09:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8bafd7c6802f9b6a9200f7d3953ee63f SHA-1: 567f9ad92a05d91bc573f883c5c0efbb94fb5921 SHA-256: f44cf5db20d449cb4590ffe5dd2c8326a250c87e798496adf12f3dff1ff8d9d4
216 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically instructing the user to install a browser extension or update. The presence of numerous external URLs, many pointing to disposable hosting or compromised CMS uploads, further supports this. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=minecraft+multiplayer+free+download+android PDF link annotation
    • http://villapellegrino.it/userfiles/files/55809718369.pdfIn PDF document text
    • https://onwater.my/uploads/file/jatagaxosago.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/6583050956.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be87487ca---80064972255.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a2cfefd5cee83b777c99ee6910dcdf7d/52881522097.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/51529791834.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/pipojoretowaw.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/tenigomube.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46038682984.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/51831851385.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/jemav.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/13195729880.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a86772e4dd64532bcae6dfe786a8039e/32691824867.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zaxajazirijukefoz.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/70880275487.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f791eb9e---43364727561.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/31899504136.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395f6c98bbc---33792172712.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/91842914883.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/11298264962.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210905191033_uz24i0.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/85476844134.pdfIn PDF document text
    • http://zerosquareonline.com/file/nezononusisukojizakizega.pdfIn PDF document text
    • http://farmina.ru/uploads/files/43734006257.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/sogizofikovepemidag.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/2810653779.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 21368 bytes
SHA-256: 68a75c1f678411b7c0c23b103ac8d40b6479de73b6330901a119785a8972828f
font_01_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 10904 bytes
SHA-256: 2f5162f5684607d3f5fcb8d7dc6bbb6f4144b0ea51288bd35d98241a5cb3d256
font_02_sfnt_off00013cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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