Malicious PDF — malware analysis report

Static analysis result for SHA-256 d272b9d6fd52272d…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 14:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35d7deeb294213b305560d74ead6271a SHA-1: cdbf5d4cba1d6cf7e5bef0ce104ea7d1c95526de SHA-256: d272b9d6fd52272dd535f907aaae3411c1f6e5a10c8c9ff3562f595fc39ab623
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://biirbeh.mn/images/content/file/60616406170.pdf In PDF document text
    • http://ride.hu/images/uploads/files/26089067024.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/42560189250.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/95097836784.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072a00e2299c---tosegemiwugolinux.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/89085541932.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/lupaxasexijarem.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/17145605069.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/wosirekomigex.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/3036957410.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/81082384818.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b5540ef637---45824396453.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210519065122.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/fikulugawuvawenewasiroza.pdfIn PDF document text
    • https://menu2uplus.com/images/file/10056213965.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7e131bb78d30a57ba47fd36b0c581314/nasejurulusotupoj.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efe786f84---36652319410.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/26493884005.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d4f0f167---boverasulo.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/94976734650.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c77c1b57ec---sunovumiduwixo.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/39008934107.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6lsvrb1valn128gncv518gu41r/72656267822.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/79821756472.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609beb1cd94d9---zatelizuzavese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cursive+english+writing+pdfPDF 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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 17284 bytes
SHA-256: 54e0df1f335c4aa63bacec15aced623ad6bcd99ca1b07290fbf4c948073a1b39
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 10780 bytes
SHA-256: 21dd9b56dea0d205b90e614c7062e505dd900844fb8898dda7a97fdb89c3922c

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