Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cda1efe6dc58e5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-27 08:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e7946ebfcdb748abc88dbf06f40dd99d SHA-1: aed293f1f0d475e3825de306e68d58a5154d0d12 SHA-256: 20cda1efe6dc58e5c9002153063c0fcbca9d6bf20402728e4947932394a52748
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites for phishing or malware downloads. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://phonphangschool.com/upload/files/towakipiliboda.pdf In PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/89752798354.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/27461780195.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/lubulavogujavunolekerusum.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/83079539270.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/20713496218.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/65585999035.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/14100120340.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zopafagunatirigepolanufu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/kilazosotisazirafiregiw.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16150fe194832f---kawojalupafexudavo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210926_E86746E7C128E2F5.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/45641400255.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/43042857148.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161495d4a19a83---wonezi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/cca90bfce468fa531992bdff40593feb/57838176579.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/87960663072.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/1764113355.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202192367215684.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/wizubemubuzotavisivojezix.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/45251401724.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/vudenaxadetobakeseje.pdfIn PDF document text
    • http://salkim.com/userfiles/file/zevufovavixasomipoju.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/87850129620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=red+and+blue+make+purplePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6c8ecc8b8---komepulebu.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_off0000c362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 20776 bytes
SHA-256: d7b2b5eff39d1130d44aada676f9d8b458972c6c6a818cdfa328e3b53c3c47ca
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 10452 bytes
SHA-256: ee2cb17720573476d0828e0897ea82ff19f09a039c2c4710752654d48d34a4fb

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