Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4efddb465a4405…

MALICIOUS

PDF

77.7 KB Created: 2021-08-25 19:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6da64e45ce04d0536a3ccb57ae1872d9 SHA-1: 334252c8db1dc253150390899f6732a0f62804b6 SHA-256: 4b4efddb465a440539b909e8ec9e31afc05c731f14b945046609155278d1b316
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. 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 code. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/64f37tmu549d0kmbb04lgcf9ak/sejikigalekekudefavutum.pdf In PDF document text
    • https://x-software.cz/data/file/50622821770.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/58520378182.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/9053568452.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d812b23c124---27174515082.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/26735671953.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/68886619897.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/92972707440.pdfIn PDF document text
    • http://screen.by/images/file/kirisizewutap.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cb642c905cd5a56ba4975e1ef9d476d6/wirukemegemubinotip.pdfIn PDF document text
    • https://aashianarealty.com/file/57803856790.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702222af79a---kimobetadojilivorurokume.pdfIn PDF document text
    • https://sinarwaja.com/account/files/90238099974.pdfIn PDF document text
    • http://www.siposferenc.hu/html/38270724145.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/zixeba.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b233f9b1de1---bewunomolanivaz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741b6fe31f4---55798731141.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/s6jk84bti31utstpp8cd78mqt4/253061782.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/2561272748.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ccb1e5aea---75930625833.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/70995f781fdda4548bdce29a67ff9667/55595108840.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc561694ae2b55ca6405b46b7f2a01c0/watitawepukulekero.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/10632568999.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/58322591415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=php+foreach+continuePDF 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_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 17552 bytes
SHA-256: 90e28952412274c8e71eeaf0a55a56d53afe49bf955ed3ac02189173f44e90cf
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 10464 bytes
SHA-256: cb3197e19ead823ade23f33c9d58ce1a21f5be0b41173441c5e83446a01adc88

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