Malicious PDF — malware analysis report

Static analysis result for SHA-256 f750b818aa4f643f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 11:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 416e254816a4e7e0e1d125f0615416e9 SHA-1: 93cc4b17e5f4665a824694dfb32643ccb95e7d07 SHA-256: f750b818aa4f643f4c0fba51c7985b4385f8dd37d7fb9f4f5646497ae8e1cfba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kerrya.com/ckfinder/userfiles/files/lasigudojifemurisapojiruz.pdf In PDF document text
    • http://popmetre.com/news/files/98506872563.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a98c564d8fa4de345ed2b6463c4a9d2/pixutajiwajuzadatesulij.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/sidovi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7efa9e9e---jexiguwezesetodu.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/28310017073.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/31952393227.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/javepixukejawoduxegamiru.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/rekagomemixuwakosamedo.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/xigeseturilofemupuxar.pdfIn PDF document text
    • https://kuepancong.com/contents/files/53008148411.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/jorozexozononu.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/52730613032.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/88081328911.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/detiwexunipalomenur.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/sisavefadimufunironekuv.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/80525830187.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/judozosasotubopojizolixu.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/bolufuvulenalumokovegoja.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/41688722932.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/5518604161.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/ludamo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ruwerutifamamabimulelu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d3bbc209eef19dce4ca3b64d26e6068f/4593231741.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313383e5d7d---84217418282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=beta+free+fire+apkPDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10056 bytes
SHA-256: 891124ca00216e764ebd3c96bc8a681c07ba74510faab4764a3189bab5d1015d
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 18384 bytes
SHA-256: f4655a86e00a5642a34013a89a1208607f0f7b68fafd89db6964cec40bc6b9ba
font_02_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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