Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f264023ff9d6ac6…

MALICIOUS

PDF

83.6 KB Created: 2021-07-13 23:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5d83b9b56afad461640b0df74859b42a SHA-1: 2cfbc51aeb9f8071e0bd5fde2e85b067ea1255db SHA-256: 4f264023ff9d6ac6cfd50c9f10ede714c23a141d66973affb7376f23f0b90a8c
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be redirecting users, potentially to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://mosconi.net/userfiles/file/54918674365.pdf In PDF document text
    • http://retco.ge/ckfinder/userfiles/files/xokesafogip.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a339ddde---bobaxoligezuzo.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/deref.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a826722e31398150fe5b08d256c153e9/38259751638.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3803b1503---zaxafewokedub.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fivavopovipatasixiliju.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/kndjhflsokgqqmnltirdsavebl/81803111037.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26919677269.pdfIn PDF document text
    • https://alutat.com/data/file/2780640485.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/dinotukuwuferefixirarubi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d8b2758ad68ea41e0c2f9c1f7bc483b1/wixozoto.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/wokaropusexuzugamuxezoju.pdfIn PDF document text
    • http://saydersan.com/firma/files/fukupamup.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/bejam.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/vedaxuxedaxedomoj.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/64666640292.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210524023124.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/34970d929635b6160f2bf89af34e2093/89109388847.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4915ce47---62390630509.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/79305817395.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/31181439684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=christian+festival+after+easterPDF 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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 10288 bytes
SHA-256: 956fb8c2b9964fa77a340b1f4481f4fc761c475790205c5d868e074b765504c3
font_02_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 16992 bytes
SHA-256: 3afc4ac1227e902fcd8a335d32c9dc227ed7e626b42c9a97d06308efa82cbccb