Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7349bfadcdef44…

MALICIOUS

PDF

90.9 KB Created: 2021-09-12 10:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ddb50d47af2fe41b32938a805e684eb8 SHA-1: f9ef84bef8bf8ca35f910a3979dac2619fea167f SHA-256: ef7349bfadcdef44cab1f87f7679fd644c4149cc5b3ae24a4f24494da91c6aff
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting, which is indicative of a link farm used to distribute malicious content. The presence of ClamAV detection and ML classifier flagging further supports its malicious nature. The document's structure and link farm suggest an attempt to trick users into downloading further malicious files, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12558866066.pdf In PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/dowiketewoxetelekuxud.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/fivitatigoriduwumaroja.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/zosapugegasinaxopizeze.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/xilenebofokubuzafadi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b8ec6ba7---dajezabetekirubumubiwumuw.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/20551017989.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/40919552071.pdfIn PDF document text
    • https://spacio.hk/attachment/file/700465996.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/39899619666.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/12f7289b4caa2f24514d82f6e8ab8743/30316593842.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/lobix.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/1938856194.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908061322510931.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/wixitofonadita.pdfIn PDF document text
    • http://asfalon.com/__files/file/kipovobotakeg.pdfIn PDF document text
    • https://windscrm.net/files/file/12776437233.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/45031148434.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/wegusosilijipip.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/74191844172.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/tuzarejulazuj.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/guwinixesudaxo.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/papofe.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8p56hrjquqrmi2jag8cnmkc9j/bevisomukazumodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=eazy+banking+app+apkPDF link annotation
    • https://mediaget.com/userfiles/files/gedoxus.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_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 18828 bytes
SHA-256: 49e36108cee2a76303849464fa533a6ee036c334ba8ae930af97d74ae30c1df7
font_01_sfnt_off00012f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B0 10152 bytes
SHA-256: 95ce585f9fd0602e1169b701dbaa4203156e461c025b4d5e110cc26113320e15

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