Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f8d185f92e0cfd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 03:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5fc0e436674a21db8b80b8987ba432d SHA-1: 047b3d8ca3d58227922694c302842cadd068b29b SHA-256: 15f8d185f92e0cfd6e746d1f30bcba403993bcff54a33408decd878e396f1a2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised websites and disposable hosting, disguised as an invoice lure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://associatedreclaimed.com/userfiles/files/vamuwe.pdf In PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/rotimip.pdfIn PDF document text
    • https://morabia.fi/images/file/pubumuzuvipoliriwo.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/xaxudinu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3676b996---poleler.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/17497382141.pdfIn PDF document text
    • http://zuche0551.com/upload/file/91551471417.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/46426996965.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/fobulerufazure.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/63sdqtg9r69e4qjtqjgrksum96/wekaxomupusubiwugiwa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d8b6758d---vetetawizete.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/3399576645.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/lofegizikunoniwilufonogo.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/398090405.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/85862800177.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/42400672726.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baec576438b---53071711094.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/81673906517.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/80703733399.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105020824244476.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0793a30d---vapifuxovinis.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d7455edb---sodobi.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/neligozomupenirajorokelux.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuvakarinoburipezekupew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+printable+blank+invoice+templates+pdfPDF 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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 11056 bytes
SHA-256: 9bf34d53a885604065a7f82ff63da36ab2e51134c8d776592a7f57fe613154f0
font_01_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 17696 bytes
SHA-256: b43341685aa2a4550d50366f6b1ecb541de24f273304e7839e048e2eab2c8f21
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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