Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce833a699f0dfb28…

MALICIOUS

PDF

81.7 KB Created: 2021-08-21 09:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4559e6ad594d1b624c199594a7453e39 SHA-1: 3754d0a7725081458d798ddd8fb4947fae5fca8e SHA-256: ce833a699f0dfb28d06365b3e385bdd124e97242b1ba47d3b7435ea122634798
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and a callback phishing lure, directing users to potentially compromised websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or scam campaign designed to trick users into revealing information or initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+change+your+voicemail+password+on+iphone+6s PDF link annotation
    • http://burrburroughsfamily.com/clients/55468/File/nabovudarekimu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde3f7ad0b---damezebigamuwuwepaxosas.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160badceee1f3f---zonopuzipaj.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/furasepotegonaxatidono.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/98348925428.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/zonijokavejenejar.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g23hn4kmi6g6pol8e0csf7fti0/doxiroti.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vivuvitirilarowiwaxa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d00f4e76d---52389403869.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/xujixolikurulazusa.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/dovopodipogufor.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/dc71af7784643c11d86e961222217ed9/panarerigewaxefitapuwosin.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c9460079bd7---zapoxexisewixebevivip.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wisepuf.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/zaridimubilarupanol.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/29979802366.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xafar.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/20489257451.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/kinaradufitugitopaxere.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cba408e64b6---mupuledenide.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/66024670277.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b527ccee134984ffd3ce856bc39322ed/dirilemisazakafasokoxeson.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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 11484 bytes
SHA-256: 089a8a90b2b4c031cbb68385705acac4cc92aeeec0871c7023e18a917300b3ff
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 17076 bytes
SHA-256: 5cdd4988676b38719c3bdac7bf62947f0965a9350a486c5abf4814122ae14040

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