Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41f05d818efaa18…

MALICIOUS

PDF

91.5 KB Created: 2021-09-21 07:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5151555d4c58967ee0b2877e20dcadb5 SHA-1: 0aaf2ed4beee49f4846dbfd3cac6553e456c9cd7 SHA-256: f41f05d818efaa18c164bfe8a6fdec9d9a7bea65534206e138fd5db1a3478bf2
244 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, many of which appear to be disposable or compromised. The document also impersonates Apple and includes a visual download button, suggesting a lure to trick users into downloading further malicious content. The presence of embedded URLs and the overall structure indicate an attempt to facilitate malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tyrone%27s+unblocked+games+minecraft+download.
  • 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 https://brukspec.pl/upload/file/89248587659.pdf In PDF document text
    • http://inter-travel.hu/_user/file/90965103449.pdfIn PDF document text
    • https://umartravel.com/files/12930108880.pdfIn PDF document text
    • http://myredm.ru/uploads/file/23798353232.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pexarinutej.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/44806735280.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/begoga.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/85900091519.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/wonanoxedixesofinumumerab.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210908_3B46D0880F3AA55B.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/nopib.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/jivikugejikel.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/begasuwipenakubegavebep.pdfIn PDF document text
    • http://sentai.cc/data/file/20210912_230411_479.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/deloli.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/64849490651.pdfIn PDF document text
    • https://remini.hu/userfiles/file/73325726491.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/5418390923.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/jinimetixufuroterip.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/88717526862.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141522b472cb---busazamitufuvifufunop.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/3442716955.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/wufakilojetopozi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044df51945---80462747242.pdfIn PDF document text
    • http://capital96.com/userfiles/file/2949730057.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/xudidubumudusido.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133df0a47758---nodofefur.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/xawetomaleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tyrone%27s+unblocked+games+minecraft+downloadPDF 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_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 18760 bytes
SHA-256: d8c22e3e9a2058f2e469643c46625ec2ddd15fdc9a90f420e67e2fb77e67ab63
font_01_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 11348 bytes
SHA-256: 9e995e425a9bbc7b63de078e7d041dff49a1f606defb870ac5e52908074645d2
font_02_sfnt_off0001465b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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