Malicious PDF — malware analysis report

Static analysis result for SHA-256 c019d369af586786…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 21:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4ce181cd2d83b2f7343c231db9dd84e8 SHA-1: 9b93dc4dc38d738435aba81428138e91d91201a2 SHA-256: c019d369af586786fb18514530f450c50646046f29fb4d068d68dadec494c410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31fb5c33b2---xewamodezagogive.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b9d92c04f---kafubuzogajaxobif.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1f5a1b8294ab7f1594e9cfe6aa228371/dexifaxilexasa.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/20412304043.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab9419b5f---15317021762.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e342b58d1---13465031308.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/xakuxugexaratilizazobeba.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/wesataxedon.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/gosubako.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074b265cc61a---25589636127.pdfIn PDF document text
    • https://coil.hk/upload/files/73622153944.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/71873545188.pdfIn PDF document text
    • http://proxima-design.cz/files/file/joxajekirovanibikomito.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zijavuki.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/72ccd52668a8e758bcc1f1f35834497a/xupuwiwaxakixekipaki.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/62484608224.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tegulamivoxixamisadak.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/78697472104.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b095585d2b51f21610f355f583667627/sulipurufubo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b67085c7---memewisedubada.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/90198143404.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4ab1f0ba---juvumuzipe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01042d20f---bibasazewuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ejemplo+de+un+ensayo+sobre+mi+vida+personalPDF 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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10988 bytes
SHA-256: 771880d41c898d2b7e9f6b113fcfcf979d40d1fab0aa7fb1012ffa5502de7522
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 17424 bytes
SHA-256: de165a19a7861500d150c9f97bdd5bcfd3985d070b1ecc4cdaaebecbc230884d
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1