Malicious PDF — malware analysis report

Static analysis result for SHA-256 50651c825d1bd34e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 14:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a2be728642c84867e45e9ed31cec03d SHA-1: 680dbc9041fffa7534084e34d04bee9c5061d82d SHA-256: 50651c825d1bd34edab6f3a8326ce3a73e9d2e18c3a35d87bd8623248551d3d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, disguised as a Windows 10 download. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malicious content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://360clothing.in/home/www360cl/public_html/uploads/images/files/50247493688.pdf In PDF document text
    • https://businesslife.com/content/files/30363480844.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/sitipipurapafevelusuk.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/98701766473.pdfIn PDF document text
    • http://519pf.com/userfiles/files/ninulepewaru.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/vuzopujof.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141929a832d9---39946420565.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353789b9932---93680325008.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/68322535719.pdfIn PDF document text
    • http://poultech.net/d/files/12761536864.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-18/20210918095824605842.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/83476445319.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/22248673564.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/betuju.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/93043317506.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/14224241924.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/38564434070.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/22285686099.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/gizivemetetozuvekex.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613753576e795---rikizekaxinenamosenewutoj.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/49883837945.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gidilifipof.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397def1551d---89819214617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=windows+10+32+bit+free+download+full+version+with+keyPDF 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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 11508 bytes
SHA-256: 526e2337cd534af2f4c6a4cc92eec2b9a701d73ac677e55940db09a7b768d98f
font_02_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 17636 bytes
SHA-256: 47170e9fe52cb30f8ba013bf57c3979aab20f8b520b9b9e798e418288924fcbf

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