Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99dfc1870fd89e3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 16:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31491852c227afdcde082088267d6766 SHA-1: 008303f7d90adb9f890ac8ee6218c03d6603e4f7 SHA-256: d99dfc1870fd89e3334de29adc93beecd377910f6c7cb0e23e2a8c1b57f3e453
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sunridgecorp.com/uploads/files/202109090410408426.pdf In PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mipemogujedipanejuvobi.pdfIn PDF document text
    • http://sial.pl/galeria/file/88908138631.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/tixokekawili.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2dc9be141---26764290975.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/83738576500.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/vetoboga.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/89256222489.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b31534a8---juzijedabaxorejuvenu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/33478298913.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/lajawedigizevuvirebas.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47373273405.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/dederaxi.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/89106567347.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/19391593806.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901162249.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091404181873499.pdfIn PDF document text
    • https://finliz.lt/i/File/19380780183.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/1035068636.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/wubojefamasesileb.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/tisixenisiga.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/repamimig.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58974bb4f237746cb32f05e7117416f4/jozunumofezamuvinoxawoz.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210912203814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cannot+install+any+app+from+play+storePDF 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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 17468 bytes
SHA-256: 497aff419e171f2378d7b70fc58aafe1cd358a3f00c67d0df975e654ef71c2a4
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10664 bytes
SHA-256: 45f50753658936d20a03249af7d99f7c108929e03a2f588754fb44a57ce1955b

Open this report in the interactive analyzer, or submit your own file for analysis.