Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff6f51134a19ad2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 09:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65cb43b16d0fbb27318c2ff767e085c6 SHA-1: 556d5ab56250bbde1e8ae1b890487777c3f4715f SHA-256: 5ff6f51134a19ad2397b0c726294842d5f841a3406868ff38048920e1941508d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious commands. Multiple external URLs are present, some pointing to compromised WordPress sites, suggesting a potential download or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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
  • 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://infrive.ru/uplcv?utm_term=chrome+android+clear+search+history PDF link annotation
    • http://phdpecs.hu/userfiles/files/wilojuribiferatadu.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/8709964899.pdfIn PDF document text
    • http://shopabrang.com/images/files/weputesatodevot.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/169976671.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kolirevozimupizimesazud.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/50989691436.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614076b37341f---gesopeb.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/wifenobumajufi.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/92690118119.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/xoritunadot.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91962173663.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091812150599.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/79036200447.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/75944783444.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141638a2bb2c---71198810245.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/xuvobafitagim.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce838e652---fibezojefifivawojeruvas.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/jejakigumunirarova.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/babarawoxuzidetanoxijog.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/detadepudaxezunejevax.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/35923319056.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tepupim.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_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 17816 bytes
SHA-256: 220cfabde32ecb2c52b03c238935ffef5a29c8c176dd7b41d4b543f73c66a65d
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 10780 bytes
SHA-256: c1300b9cad3f743813a1b3e030cfbfc4e62c60cdd60933b25877956c662e319a

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