Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4171de5ecac0a7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 19:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f05fd8a3ee7dbd52b15be282dc5ea93 SHA-1: c6695798214ad5855f3c6b31b69cdd9057a85e37 SHA-256: 7a4171de5ecac0a7a3d03efa11533b237d0997d4a00fb33dc4036ccbb5c14bae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use as a potential execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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.
  • 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://mytalk7.com/_UploadFile/Images/file/59494039935.pdf In PDF document text
    • http://casms.org/atts/news-files/file/35180706805.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/turesamatol.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/palaxunokeziwogebaj.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jupagufe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613567db93081---91846612494.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/40de7cec8f8fe45e1694c32b7b0a2347/2505819477.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614335445b823---30863731899.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/28151735676.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/fusasifuti.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/rojadefasajavusaxumixodel.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/mamugigusigafe.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacf0d0078---53414498535.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vopubefim.pdfIn PDF document text
    • https://toocapen.com/files/67287079680.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/52972874178.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/gajurokituk.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/ronopufoj.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915210703.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/pebeketedef.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/14963081630.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/73809625261.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/sitoziwijorob.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/jewivefowanivemimanuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+find+my+android+passwordPDF 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_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 18908 bytes
SHA-256: 61e1e81b265504480e20f282124af57bf3f740a23fc81db2bbdc64426b58486e
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 10572 bytes
SHA-256: f569076819df8b6726e1fc4ee23ad9691f441d29607d79d89c0faf6d15419741
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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