Malicious PDF — malware analysis report

Static analysis result for SHA-256 411e92cd9f2e9498…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0b4d2f6c4786f08ef05af0c0c1c7634 SHA-1: 84c8aaed5217a5b5d71035ce396fcc7db7358451 SHA-256: 411e92cd9f2e9498b0a812d19dbf6652d213a47cd7f568e355bc51d81220bcf2
204 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'Clipboard command execution lure' heuristic indicates the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous links to potentially compromised or disposable hosting sites further supports a malicious intent, likely to redirect users to download further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://mosconi.net/userfiles/file/7951342891.pdf In PDF document text
    • https://pyccenter.com/images/Upload/file/pufufitofupezupiwojapuxas.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/kuzeza.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/magajotewixel.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/84254534752.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/30852893108.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/32612556591.pdfIn PDF document text
    • http://tavio.su/files/file/64665187058.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/nofixibudupabewupinot.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/febawefulepiw.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/56805882087.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/towiroramop.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134398765723---neninakutisipoga.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/74509321849.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a131cfb21---basipijemenujepusoxin.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/vuduxonalubujit.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010714391095.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gawoxepexawedoba.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/10657914221.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f535660fbc---dukekevadubarap.pdfIn PDF document text
    • http://0048.pl/48files/file/sixonigulazuvula.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/dulaboxedo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613297b2e1abf---20757124899.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/folikesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+windows+7+in+androidPDF 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 10236 bytes
SHA-256: 018e9e970f195f3a229da5aa3a0150aee20602ff0c709718c3a5bf4dd078ed1c
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 17768 bytes
SHA-256: e7a746fb1ecd7bef8ed6a21b96c549ce46961eb475fba1964493789dda4bbe18
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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