Malicious PDF — malware analysis report

Static analysis result for SHA-256 28235dcb6ec4952f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 13:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bd56853fbd8b2f38c843ceef0666c9f SHA-1: 0b0663bc4d64e8e8f89433cda37bed0f86c26e96 SHA-256: 28235dcb6ec4952fd830c82e8924acc1f312fed9e0ade84eca4f0fd7cdf3ee5a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a command-line interface, which is a common technique for executing malicious payloads. The document also hosts numerous links on compromised or disposable domains, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.superior-inkjet.com/login/ckfinder/userfiles/files/sujawesosuna.pdf
    • https://serrechevalier-skifun.com/imagesfile/torejozoxiribabo.pdf
    • http://beiwendq.com/userfiles/file/zoxujobaxevoxasuvigu.pdf
    • http://www.derbysignandgraphics.com/uploads/file/vugesurunibuwonitidit.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/bigipud.pdf
    • http://sage-chem.com/image/files/20210907_113716.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d481e101---43109226077.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd5cd0e06b657952ce02579dd7ef2e1b/takorigopodedulopod.pdf
    • https://hantverkarenisandby.se/UserFiles/files/sokosepure.pdf
    • https://citronel.com/userfiles/files/jogoxavero.pdf
    • https://leuphuotcamap.com/uploads/image/files/81370140687.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ea3ef9810c00802d574658bc5af43bc0/75808343217.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xuvusaramulirawegasufo.pdf
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/75999524103.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/245951532.pdf
    • http://artepcb.com/upload/files/wuzowom.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b47538e8a9576183a4a8b73aef1ee03d/japopojupu.pdf
    • http://hzqljsj.com/images/upload/File/vudozazogafurixa.pdf
    • http://snft.ro/media/file/lofededuvetojifisizixa.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408f67439e8---94520330991.pdf
    • http://rc-saty.cz/gais/image/file/41765777399.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=me+before+you+yify+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e375.bin
6e5b118cb250801b83e1088518cbce4c81c9b9f70d53483d2adc2ee381789ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 18884 bytes
font_01_sfnt_off0001149c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 16792 bytes
font_02_sfnt_off00012cb3.bin
5323d973ade15c26ecea2b55cec09e8376ea4a63f9c2074bc11503102a40354c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 10516 bytes