Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc865c08762e4f51…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 09:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b433ec1fbffe452bc9af00f3272d4eb SHA-1: cef269010ee10b2480cf7b1c7a632e7cc831e549 SHA-256: dc865c08762e4f5143271f3b3085161f5e7798c23ec5f259ef72af4a8526d8cb
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. 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 in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+to+increase+phone+storage+with+sd+card PDF link annotation
    • http://zlzljc.com/uploadfile/file///2021090309594814.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s1l3ks1r3nhhqe7nttgptlu7l3/jujejinapewokekixiwedudum.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/xogositomifimavozo.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/vamok.pdfIn PDF document text
    • https://hssanesteban.cl/files/vodewebitewufotapovajule.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/vokewakutuxixevo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2dtko54p6fj41ugse4dctsnlfm/92095391726.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/70217214830.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/27416908816.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/pamifonivabexovemubupu.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lavuso.pdfIn PDF document text
    • http://martonelektro.hu/files/file/8006608669.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/womanez.pdfIn PDF document text
    • http://zenkatsu.dk/files/83287864877.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/93269235981.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9ea84388d---93427086708.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fetusojef.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/nitumiwavelina.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/ruzafedalu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/30493661281.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/741bc32a6c712adcb7ad967b471db245/93018583996.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/dogiko.pdfIn PDF document text
    • http://rurisnet.org/images/file/90802631060.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/94924824856.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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 17304 bytes
SHA-256: 1222120e8f7bda9dbcde429b44e62f6d84647f113319eab2bf6ab36e54aab334
font_01_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10824 bytes
SHA-256: e47903c5afd000f5948a1dce3602e8d21c3e56bbab7ccfb1d303b0eaa7197945
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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