Malicious PDF — malware analysis report

Static analysis result for SHA-256 6148bac03ee79063…

MALICIOUS

PDF

92.6 KB Created: 2021-09-08 11:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 671b0a4a28bc19901bec41773d53d33c SHA-1: 50e9ce426d725d941758fd1769f86c88514fa83d SHA-256: 6148bac03ee79063f4593f86d4cd0582ab85ca77076946d52cbc4d1d2b02fa25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous URLs, including those on potentially disposable hosting, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=a+modest+proposal+pdf+questions PDF link annotation
    • https://n-v-v.dk/userfiles/file/zozixilinirin.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/96159938415.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/11362028927.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///gajiziboxuredojatirivoba.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fa6861d25a42e9e62298f88844243615/35899086524.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/81018604306.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/72714073164.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/5631424649.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20218202148381453.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/72206646586.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f56f2666---jigaxiremagasuxik.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nvkhg06gonjhonl8uukmjh9as2/95707662396.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/gubetewi.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/345004476.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/68124096065.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021071804425773499.pdfIn PDF document text
    • http://dgjst.com/upfile/file/rozasufusulijufelivafipa.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/desekozu.pdfIn PDF document text
    • http://cl-pub.com/files/files/69378885762.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/33108623561.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021081509053473499.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/9973928089.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/godapoloxemujizuwutuj.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/3929172579.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d0894ea6---kuxofagoxukofubokabeduw.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_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 17276 bytes
SHA-256: 89fb0beb52f97678bc339b43d97194aebf9f74f029964a2c3e4b520dd950d2ff
font_01_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 10888 bytes
SHA-256: 4174522501d83c7028557b3b96a8784036be20c6915e2dbce72c632a191708ce
font_02_sfnt_off00014ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1