Malicious PDF — malware analysis report

Static analysis result for SHA-256 792809ede77bb074…

MALICIOUS

PDF

89.5 KB Created: 2021-07-27 22:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 242e737259e70ba3ece3fa1f9f703ad1 SHA-1: ec2362be750dee4ed0fccc34a242d95dce43f276 SHA-256: 792809ede77bb0746b9949816511924d4be842f6ae8cfa505a006f6348179b66
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains instructions to disable security software, a common tactic to bypass defenses. While no scripts were directly extracted, the presence of numerous links to PDF files hosted on various domains, some appearing to be compromised CMS uploads, suggests a link farm designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://juhaszautovill.hu/userfiles/file/41994792214.pdf In PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/xotumekiberatepudifadi.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6a7240b4c65e3fd7b0e29017d24a6e40/54373267483.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/49hsv33j9pfch40tdka6kj0mvt/67919327696.pdfIn PDF document text
    • https://ijp2.com/contents//files/jegopaxupavetunetagodexe.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5605464668.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413c1946a8---zaxifuwir.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/zamonezilifakuzoronikowi.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/wurokuvugerilu.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/liriwipujesabedixebup.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6811166a0287d1cde5d4525279f9ce8f/zawita.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4da38500---10975374258.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/21e871325cec4968c07a97877a549e5f/5208254596.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sitifisixobap.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871934bbe39---46467681445.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/budepamamoxogatud.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/babalepegoxiwuratawaveg.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160abb262425ed---59667488704.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/voxewiregivivusaj.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/38172322105.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37186be09---ligipozebedituviganukufi.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/74868923930.pdfIn PDF document text
    • https://arerp.kr/data/file///10799896019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=brother+j6520dw+wont+turn+onPDF 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_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10788 bytes
SHA-256: de5541b590610ad18f2b28080e893276fd90318079171caff0a6a1352351d39d
font_01_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 18160 bytes
SHA-256: 1cb62ec4814e4aac7ceb8b21296df6d18b23d67f2521d64c1d8045104060cfc2
font_02_sfnt_off0001402f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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