Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a1ba21383269e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 01:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cee73ac9b3499f74b13e0ef9fc3b9afb SHA-1: f22334c2e6a9ef497684a4e9e58f3c10a7220620 SHA-256: a91a1ba21383269eb0bf10a4821def711e83b629bcc9fce3000b1291f6386d97
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of a 'download button' lure and callback phishing indicators further suggests a malicious intent to trick users into downloading malware or engaging in fraudulent activities. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=mod+tools+mlbb+original+apk PDF link annotation
    • http://artediapharma.com/upload/files/82533098072.pdfIn PDF document text
    • http://www.bash.cl/media/file/6774696680.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/voraxokujosi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/64494472b07213b3deed237c1fe7955b/76869412679.pdfIn PDF document text
    • http://93564497.com/userfiles/11054126895.pdfIn PDF document text
    • http://enewind.com/pliki/file/vumomarogobidogibuj.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/57797779064.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/24427844648.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/63849797628.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/35488788576.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/sogurevudofakuleve.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tejariwumobokup.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/ketilexirolezibilurew.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad471c0eed---56287157346.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/12100371312.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145e94604391---69038795998.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066522e7ee---26615913494.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/62656099507.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/57535887042.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/guxowu.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nujekabusewupavon.pdfIn PDF document text
    • http://p-energo.ru/content/file/52544517058.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/tibawiduvoburisog.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a362e97160---waninolezavuv.pdfIn PDF document text
    • http://punaide.com/userfiles/files/winovaxozaxovedodolobiget.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/pijibarezavisev.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/pobibutulubo.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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 19268 bytes
SHA-256: e588367e6c02f9986ee6645fa1173b4362381ab50c436b9d1ed655f72954c93a
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10828 bytes
SHA-256: 2c96f6cec4fc56e7409af9b3644709853294a89e9f894018ec12fff2cc8ce322
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.