Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecff9907ffca150e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 11:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6eaa88f836921ac88ef102d869536528 SHA-1: 40af9978bb563fc6213fb41fe9e5ca09d05cd0ee SHA-256: ecff9907ffca150e352f3f8d21c10edae987a18c930c864be7d38e9eba2a092c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including lures for browser extension installation and clipboard command execution. It also features numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a social engineering attack aimed at user interaction and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=install+android+on+chromebook PDF link annotation
    • http://gestioniarmatoriali.it/54822482777.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/43368653576.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kcb6768pf9sj8caro7soo08257/dexezopodadomoxapikako.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/xugur.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/tovuvipumipo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/74456544143.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tisesivoru.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219211535209210.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/jenenepelivipubugate.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fujoza.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/99812427274.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/54136828790.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/tefozifagezawo.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/rojezazotekijugedogemori.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kajorexemagejaj.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///nazaveporisasefogakisexu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5pk733i4ptti3dhmo6t9pvt9gb/jixupolunuresap.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/gadevifeguluzefexefun.pdfIn PDF document text
    • https://datenglagi.com/contents/files/netovurexuzepelasovu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7a3995ee0f985b181ead030ff6a01227/kizamil.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/xobimitewezejalug.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81568c9a7---70367505867.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/76493476174.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4f2d69bc9920fd632d25e0904ae32192/loragone.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/74408878735.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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10820 bytes
SHA-256: b437651f0d7a8218bf2c9048a0501ae312c1c847e7ef1fba28e6ddbad852b72e
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 17732 bytes
SHA-256: 0d763f3aa9a1295940740a074fe28c4416b0705c6300c9e58d2fb6d0f9e94948

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