Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8c1db9d2d0e40d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 06:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6ac660485a9d9af3384da2253b7e88c2 SHA-1: 0bc6ce326b8c70323d13a578360e0a003f46148d SHA-256: 3d8c1db9d2d0e40dc9a3eb5c866081dfbca6346644dc5b114cc9fe90a004cd20
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=fastboot+gadget+driver+spd+64+bit+download PDF link annotation
    • http://galettedesrois.hu/userfiles/file/japut.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/22770578735.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/bizojepumujukefur.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wodukazoxabudefelo.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/tuxewepobanojojuromolup.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/44014787847.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/furalasujefuborupinotorox.pdfIn PDF document text
    • http://unseretochter.ch/images/file/fedejakulapabisemuliri.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/linajifaj.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/zalajipumumiwup.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/14608898077.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/49440767288.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/rupomi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6747a07057e684d1ceb73938f2467713/27409867616.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/99181849454.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/7453865623.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138b2af69a81---jebosofij.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/07b5b503b9076190861d8b9e7dee5737/vanekidatetofanos.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/towutojaradisuj.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/vepasutoxulaj.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133723a70866---detusajafe.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sumenudizikowuzesidazoga.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/fusutirozugokurolufoduvu.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/fimajutazujejelet.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161306d7d9c757---36224301902.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 11084 bytes
SHA-256: b1c022319c0dc462f6d83d667613f0fc2263222b23e9627aebf7e063108e1a0b
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 18260 bytes
SHA-256: 71c1e9de0cf1000bda298f61674854b10c0d2d246796002dfa940562d5911b70
font_02_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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