Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b9da9fbd7b754e…

MALICIOUS

PDF

87.2 KB Created: 2021-08-06 04:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8eadf0b67cf2add852e0671804bdd18d SHA-1: f207c53315afafd532c36ce51eb042a06b19ef6c SHA-256: 75b9da9fbd7b754e02d838592971b56242333104fad4ed453a6d9df04344e8cc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3590a8b6f---42651046518.pdf In PDF document text
    • http://ibb-online.ru/f/file/85656032670.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/20po5ji9m5vcgvgahk8okd7d46/89323953919.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/weselopimetu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f862c44f0---gavefiwolosakazamosara.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/dejitukakisokozipaj.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/suzovufofodamejux.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/zidavusef.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/1085263893.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/pogomapaw.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/kukovale.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3528282c7---tadifemevokazamezadamuru.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/10058534089.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/gevotufezus.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7ac16c73057d7cefd8e8797929fa55ae/fodof.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6ea9eba2a99294856b2ca51b2bc55722/nivamasulavad.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb89211469---99995353204.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/24860139294.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a313995adf3---nonixe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/635cc7b695e669d365feabfbba892437/nuponuwuwamur.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dujigavigiranezegugijikaf.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/supajuvo.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/6659045373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=commission+agreement+template+freePDF 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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10732 bytes
SHA-256: 0296b6ea0a0307004a89465eb3acd85f61f5e2da9f647092f1713e8e7a6da393
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 17056 bytes
SHA-256: d35916d8f017c1a5a1f406a3236e4f054b94d81e82f9ae9774ca1c48a815181e
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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