Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c554ebdb16495e…

MALICIOUS

PDF

90.2 KB Created: 2021-08-05 13:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6058014f6753e9608b4cec49f1a5db9 SHA-1: fa3551b1f342a125ba5fc663db39d50a6c057923 SHA-256: f0c554ebdb16495e4a23b4e8645540bca2774c4a7fd4091dd00e0d91a190d53d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=can+you+use+bissell+crosswave+pet+pro+on+hardwood+floors PDF link annotation
    • https://accounting789.com/ThImg/file/waxigas.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/74416781017.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1tip2a6urmunteh2m61i2a8mmi/50122307112.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c833f1e5---kojidejom.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105082209.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/88640623643.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/67584918006.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zojowo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c990ea933db---35435351146.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4caf02624---turewitalufunamenu.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/94c8c58ecd16ff58af513621c36e98e6/55238371962.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8b51eb99---92858233864.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da28c95bde2876eb4ff1e87a9be13d99/bizitujezuvudi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/vudedemetekawomonamori.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c955f44a69---libikobiwibakadosavo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/112d23de039c1fc0c817df758a7f450c/mafelijakezikevibu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e94cc395---80878798561.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/86651715930.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6c495cfa47219daad805e1179340a0fe/pazurigolujebunuxa.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b4466169---kegamijipuwor.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/75584589976.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa33f0a402---rulukodivukuderiwovirefex.pdfIn PDF document text
    • https://schmitz.cz/res/file/rojogebowezopawes.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d67edd3c8---rokamomojifudimawibiguv.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/93834646118.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/ligipuso.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 19796 bytes
SHA-256: b7df059ea531418907ed7da23d31ef21bc5c57fe9ec1fba32d3f3bc60dbf4100
font_01_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 11256 bytes
SHA-256: 1eefbe378b90bb35ef3329f53216d96b60a5e62f5d8e152c380c1da1c3c58728