Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcdec905ce5d0c0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 13:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d059950bc8503be34df76a9f12a079e5 SHA-1: 3ebfebc4d62437d754126d89571e6e39ec761337 SHA-256: 5fcdec905ce5d0c0165aeef23dddd6a04f8e753feca97e8bc9823596e75103b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish for information. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6304

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://craftland.de/res/wysiwyg/file/vodewolusufizufexogob.pdf In PDF document text
    • http://jinyezi.cn/upload/27408596678.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/40100260381.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nexinowuzedufuloxejez.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/34440780084.pdfIn PDF document text
    • http://mextro.de/upload/files/pemix.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/kupozurajaz.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/7662010024.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/sumonuvaga.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0e8ee011---95666125442.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/14799985962.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/50502888630.pdfIn PDF document text
    • http://kasargod.net/uploads/file/87566088476.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/2633950951.pdfIn PDF document text
    • https://22importexport.com/eimages/file/3594595734.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613908d12e915---rudumetogudedositazive.pdfIn PDF document text
    • https://epiphanych.com/images/file/favemalaxuta.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/gasijus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613817671f448---rufodudetabiloz.pdfIn PDF document text
    • https://ferropula.hr/files/26649985761.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/rotitow.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613418ab0925f---boxukirurim.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/xegefewifiza.pdfIn PDF document text
    • https://svltv.in/userfiles/files/61286836262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=postal+code+cabuyaoPDF link annotation
    • 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_off0000d48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 10424 bytes
SHA-256: 1fd5c0634ebcf0e8916e48524ed9b661dfc6d5c255165b538bb90be7dd8ffbb2
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 18988 bytes
SHA-256: 90768802a1d574b0ec7ba1383cb6f759e95c3e0d62ca13f6743ef8e7f8b97021
font_02_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1