Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11c730fefbb915f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 05:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad351f0d39ab11de21ac400d7323e011 SHA-1: 8934027195dbc8cf01e549e20f6da76cede43605 SHA-256: d11c730fefbb915f79f3f4d32c190633d6258465ada8a9ddfb92e2d575d021f5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating an attempt to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The presence of embedded JavaScript further supports the malicious intent, likely to execute further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://stavclearing.ru/upload/files/31917001967.pdf In PDF document text
    • http://dija.lv/public/userfiles/file/zomomobimilor.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109171726505121.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109060459199445.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af301ba49a---96059364512.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161407fee3560a---9577222109.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/58513170288.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7c964d45---refanof.pdfIn PDF document text
    • http://speckrepej.com/upload/file/wepevunimilo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/sawotifupuganit.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/buvuzakagurakumibazirifot.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135284670d26---399697626.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613127e77db8c---75946565905.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/getone.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/4406434530.pdfIn PDF document text
    • http://pasaru.com/upload/files/pirasifasiwimuro.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/40120783142.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/878303b27178c14d15e2f5be53d7bbd5/69666614362.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/lapaxatogip.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/kawewizas.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nixumimedeluxopirifil.pdfIn PDF document text
    • http://irinabailey.com/upload/files/29512360589.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/barazesafasiburito.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/guduka.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/46842973691.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/35115256009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+app+daten+auf+neues+handy+%C3%BCbertragenPDF 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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 11260 bytes
SHA-256: 338272b825d7d4715f3510cb6351fe9e14f60621c970bdbcf848acbcad8e73c2
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 18640 bytes
SHA-256: 46653a5077f60a5ed7d78befa15f78b6617af8f6b51aa02d572d5f2c3ce8c6fb

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