Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f14bcc62088e95…

MALICIOUS

PDF

85.6 KB Created: 2021-08-16 21:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e7545ef8514cb168dca1cc60882559cc SHA-1: 2da61e40bb76cb3b1a9f4a2fbbf43f0bba32a574 SHA-256: f7f14bcc62088e959ea4ffc1cd050114b7924d5c994b0bbf2d3c7e95a3ccbd98
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=christmas+version+of+hallelujah PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40191a7d4---sebolomakonanazol.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/pudiw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b576c669---63570650067.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f5c8ac8eef7a61233d8d4449e004f68a/40807758986.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b929db46cd691a9cc906384910663c19/15893554917.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/65104955770.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/zomikojanisim.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/sabasudonuriz.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/80269467815.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0804bce9---dopuz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160842a2773777---14539692379.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///gikobuzamomebidezo.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/10762285536.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c1d440c09a37b3e05dcb359c7aaef32a/numojutubijinokek.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/pilanafito.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74915979847.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/39617277128.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kepasufafenezuzanip.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/sigolawozawerodofejejo.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/b63add05222c15bf99117d253807e458/41164503963.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/974ld4gk5grfejbhd296c8tu51/80626828650.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/06b6dd7c55ae3b06ef7aa4cd722a5d0c/47645858583.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/xijupefapofebepovaxij.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 10808 bytes
SHA-256: 9aa4433fe955094ab1f61146a509344e1f418d2d73fffbb77ee2cdd02911efbb
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 17268 bytes
SHA-256: e690901e8ee9ead91c7145385c0c96ba405d9d53325cb0a1dfe538fd96fea7d8