Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba7d35c9d1e314c…

MALICIOUS

PDF

114.0 KB Created: 2021-07-22 17:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3a81ae4181470e3b4be69019c24dc2a SHA-1: 8dbfe9874ef36cb96af5c7458ac9d857ce3d8b9e SHA-256: eba7d35c9d1e314c2b6de0bf9eccc6383938afef257366759e130c1afe06bc08
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicates maliciousness, and the overall pattern suggests the document is designed to manipulate search engine results or lead users to malicious content hosted on these compromised sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160704e2c12ed6---62073084003.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/wududofirezuresitalo.pdfIn PDF document text
    • http://vieclamhanoi247.com/upload/files/zigogopipomalorofel.pdfIn PDF document text
    • http://aimic.com/userfiles/file/gitefomodalowanusasaxoveb.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9eac30772---74078062660.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da0ea295620---gejijelumeduvaratew.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8419577ab0---84584897744.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/7813808305.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b66905b256a---40716619465.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2425ec24---89890675600.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/sigukiveneba.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e33ebf44---84178634734.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pitolewileximomaru.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sazezaduvus.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a1ca9db9---novitevimamoxa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c630a9a85c---birewatubaz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/92955952753ff4e754f3da3e179afeb5/29259273128.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707499c1bf1---jemuseto.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c2f19be59913beb6bceb6f500e7af3e8/luxesewabisanoli.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29525339037.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/vazofujodup.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r57bqel7neg5mbm9k2g2k0vf6d/27450495679.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/62600371554.pdfIn PDF document text
    • http://elma1.ru/!upload/files/31671288386.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/29vdoi0if7vji5d156omdk3on2/kaweruzolovajowufovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=english+file+test+bookletPDF 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_off000160d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D2 10444 bytes
SHA-256: e72aff97daaec7a8eb379d981ae7c2920a0932b216e77a920e45db03c46dfdff
font_01_sfnt_off00017863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17863 16332 bytes
SHA-256: ad54390f3f02788fd9f5f755659bf31b9337eb3468bd80355f298e844404e1af
font_02_sfnt_off0001a24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1