Malicious PDF — malware analysis report

Static analysis result for SHA-256 53052fb74573bb04…

MALICIOUS

PDF

77.9 KB Created: 2021-07-22 18:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b5774d917d57dfd4bb8c53a60ad0f60 SHA-1: f95896ee800e577ddcef0bda0e78081822605a63 SHA-256: 53052fb74573bb047b82ecaeb5dfa4cb04a51649077ccb8bd4acf90f33d5d055
156 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 external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://kino-cosmic.ru/sadm_files/47132449947.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/08449f6b52574bd9a35528167af96f40/74227244528.pdfIn PDF document text
    • https://yuss.it/file/vipigodevolujinikafoxedu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/41ee79df9a6ae308b8510859b3659ac6/13119006264.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/11692965206.pdfIn PDF document text
    • http://uci.ir/userfiles/file/43832092572.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107010251.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078afc56a1e5---4592609082.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/70391181823.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9214853facd06988f9d1af56238ef1fa/sodoxaxud.pdfIn PDF document text
    • http://planetamama.ru/files/file/43520510573.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ad7cb87d---baderuwibizuravijuw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094305d3312c---70152248973.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0cb8njnosnk94fppqfiqark98r/80250967813.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jirogul.pdfIn PDF document text
    • http://immopolignano.lu/images/batidemixewaj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8413742f---13222235422.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/lomowagepenupapunorod.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2c7f912ac9d82ce4ea3f675085191c90/loretagem.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd015801ffc---83639119524.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/gobowupisaretumesumix.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/vejobopedanojujopew.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jmon6fprfh2npe7n5hj2bf9bv2/77314048682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=happy+freaking+fridayPDF 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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 10440 bytes
SHA-256: 8e20f680e5c44c8e8340b546bf4d5fc3417ef3dea5e1b89ce573bea523f0fbe7
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 18656 bytes
SHA-256: 8360e2a6ffcf2fd351ade6b010df637534843f966955c0508a4497c02480e0f3
font_02_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1