Malicious PDF — malware analysis report

Static analysis result for SHA-256 509d61a1ee01e8a4…

MALICIOUS

PDF

93.4 KB Created: 2021-09-12 03:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60b3bf1fe42e7dadb499131da4b50035 SHA-1: 654be1dcdd8c175d529dc8d7b289028ef5746980 SHA-256: 509d61a1ee01e8a4c1073542e840608bd5f9a90239081dbc5abe0d46aed8a7e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is unreadable, but the heuristics indicate a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/92356234732.pdf In PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/ruwonujudolenij.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/93728612368.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0ae6d726---3222452363.pdfIn PDF document text
    • http://xn--49st2et51duvk.com/upload/files/35018733529.pdfIn PDF document text
    • http://berbun.com/user_img/file/24226428766.pdfIn PDF document text
    • https://beaszemin.com/files/2732433765.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41415033716.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/munazusozikavirunufoza.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lurilexajaweb.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/93666368586.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/ruzumuwizowanuxas.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/xerokexabufifesa.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///52998623248.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/vokajesolologovi.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/20349214451.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fe53736b---42022994822.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xovemirijug.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8slehgrg9tj2ettc7knej99ufd/rovuvef.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/22188482015.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/53179112206.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/23329390833.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/8329270921.pdfIn PDF document text
    • http://geose.ru/userfiles/file/lemubuzagebom.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/wifufapom.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/69509677083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ppsspp+gold+best+gamesPDF 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_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 10580 bytes
SHA-256: 83b2358a329dedc1046f0472aea4d17ff2c04e5b97010d6815bc57a922302b94
font_01_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382A 18372 bytes
SHA-256: 357bae6a43e96b0f68a1b03399a4139aa9d4ca8932e927fd582e0886a5ccc3d0