Malicious PDF — malware analysis report

Static analysis result for SHA-256 966b5c0c756b0bd3…

MALICIOUS

PDF

83.3 KB Created: 2021-07-19 15:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f250869eb28b0d1eee14df1f1a40000 SHA-1: 94bb2c298baeefc894044e2edd15556dbc9761ea SHA-256: 966b5c0c756b0bd3fceef74153acacb51019d65b27ae10688a3383c8261c8e72
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution T1566.001 Phishing: Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. The heuristics indicate it is a link farm and contains a lure for clipboard command execution, consistent with ClickFix social engineering attacks. The document likely aims to trick the user into running a malicious command, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://hotelpenza58.ru/ckfinder/userfiles/files/58082881520.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812c488328a---tidanafituzinasidi.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7a2b5b154c1445fbd84599b3f1e7ca36/xitetam.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/55238610746.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/65863693665.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/kuvijoviviv.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/dumukogizej.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/tumikefufiragitima.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0082a01e---73007988227.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/kexutugokaf.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s0mjc53bb8g06vhqbnofshlrgi/tivif.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/5282773471.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/rojonakoxaxugasoroxerekof.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a76823e59dd---jafebe.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/ziketutesisezanokuvo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa74570b97---raruwoxulubamonagonutazen.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/lugakegaganofedupozibopi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/64508719086.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/94308674041.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be18ab9bf90---72363657356.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convert+system+disk+to+gptPDF 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10828 bytes
SHA-256: 0533ee5b58210e5654c47c1ba6df2543b22a0260581249e26dcc2f7850c8dad4
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 16944 bytes
SHA-256: 8bc45ce9a878a1eec77b5f4c2b74d00c6703b5c309e4c4efd6073ed61f66e2ee
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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