Malicious PDF — malware analysis report

Static analysis result for SHA-256 d909555b5f447f84…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 20:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d45bb826763e645788ac5e5c1b8d1b85 SHA-1: c0d516e71b2c67a530d8f0ddc5915e245e9eb13a SHA-256: d909555b5f447f84c1adb8ebc639cf5fbc6db1368b0c992c075720009b4531b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs lead to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of these links indicates a likely attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/be53bf003a61441d207634a37caeab19/15856703562.pdf In PDF document text
    • http://51www.org/uploadfile/file/400dc9e35b3a7f9d61df0b401dd68bbb.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/64302404570.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ee49b358---33150282092.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6697ac1c---fedenuvate.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/20589048641.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e4b0f01a6ea4bf8feadfca49f39a97e4/88467548603.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/f3a10a582b7c803204fbeeeca954143a/dimiwivixarudimadipejugis.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6ae74f37dda663dc8d6f18503c7c390c/fadajotekem.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a67666689da4483ec2864c03808be0f0/sanibu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/xatoguwulavizemutad.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/35286571741.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/40927677362.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b0e38921---250490129.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ta253me42bum4hmss9lajl0jhn/venebepexam.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/5098072853.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/61892017610.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/weligarunedopezulujudiw.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jljjp0guth6mmd6r05oad3ti50/putopemozebez.pdfIn PDF document text
    • http://18554080.com/userfiles/file/gugopekudowo.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/58689305344.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/17131804029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=personal+objective+in+resumePDF 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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 18080 bytes
SHA-256: bafc3942d16ea069b27b8851f4386a569ad08aa712ca82ca1cffe7dc2e30ef24
font_01_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 10828 bytes
SHA-256: 876dd80c8244ce04cb6dc4150894f14413b66fbf835cffef2980b7b1cdd39c3b

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