Malicious PDF — malware analysis report

Static analysis result for SHA-256 6101d040f5d87973…

MALICIOUS

PDF

82.9 KB Created: 2021-07-16 06:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac743fd56182825b76085e141d1b7314 SHA-1: 7fef1f09372fcee7439900fc9b6e0d2464994e9f SHA-256: 6101d040f5d879739d6b536cfb0eb9584b6ea7db589a5d1e23783b18359810cc
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. The 'Clipboard command execution lure' heuristic indicates the document instructs users to copy and paste content into a shell, a common tactic for executing malicious commands. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a link farm designed to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce02c87b5---buxodigixuxoxulojixerevi.pdf In PDF document text
    • http://saovietgroup.com/upload/FCK/file/99638937746.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bff66476abe916382da4973932a0216b/1498668941.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987f2516310---famediwopezutakegepubid.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/tifezew.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef71eeb5e---wazimikusufopigu.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210618_DEFE72C87335F125.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/64764912923.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ggouuuij6c6cpgkqofu7ndb9tp/xexagola.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/bapokeroxob.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/439590001.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/pofijawenomabixebam.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/03ec59f5fb8187559a6a4b0a34b0d4a5/gawan.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b42b9b1d---gonojotebosize.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eb4ec7149---xezawumatobofivus.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/juwawagutulimidifemobu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oujgc2c5kqvc127f1vfvqodmki/wozufagejujilij.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ed600405667a7c842eaef099dbdd7e6a/97873245885.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d027852caf6---jebaje.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/xademurogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=information+security+mcq+questions+and+answers+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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 11132 bytes
SHA-256: 33916f44361bb9a82eee35d98f9035f27ec717001c0a8a916224d36348e01fb8
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 16588 bytes
SHA-256: c57660948aa90e3b9692cfea0feb05be4b239a3c81cf1aa2dec274cccebdc473
font_02_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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