Malicious PDF — malware analysis report

Static analysis result for SHA-256 c243394fb49e04f1…

MALICIOUS

PDF

112.0 KB Created: 2021-08-07 17:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4f21365e73023634536ada36d231e44b SHA-1: 0d3b1c8210e178482d814257f90803249f37540c SHA-256: c243394fb49e04f11e8f6e6a80d145c1e393ce5c2fc33cdd33646b43f942088f
192 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=what+is+the+money+cheat+code+for+gta+v PDF link annotation
    • http://srutimusic.org/userfiles/file/81620833521.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160afeef7b6e74---wowomimuvakibi.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/86224343758.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/rimunifabuvunabojatale.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/xevidavokajidolozu.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/23985631557.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/16943606991.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/13cmq0q5nlem4mdthhm5k4m3i1/21245640031.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/af3fc5fc31d317ba9e5188a94696412a/lajasomimetepovudugus.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/nofegezokon.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/27301872758.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdedb0c47d---fagel.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca2e10a76---lagebenobudifexo.pdfIn PDF document text
    • http://livilgirls.com/files/60471602707.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/jusepisofe.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/govodonuxugisosalixanexo.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/dakurojujivif.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7529374f181421d7c291f2c02ae7ac4a/9549695271.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/89a1uq4qan89r4vocoa5373gb5/32141686446.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/57525648221.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/gixesakurafaje.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jokelorapagalarulusu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8f869d7d---78241470503.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/legekuwesisomugakixifa.pdfIn PDF document text
    • https://hsngamings.com/gta-5-cheat-codes-pc30In 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_off00014fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCC 17900 bytes
SHA-256: dbebd61aeb500edce45222b57f8026127949874cb605ce49115726da20ec5f5d
font_01_sfnt_off00017e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E80 11048 bytes
SHA-256: 313933fc2f4c06d1d1b4c049962eaa686ac98fc7badc35599d1c2fafbf8bae92
font_02_sfnt_off000197eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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