Malicious PDF — malware analysis report

Static analysis result for SHA-256 e453ac1683ea6f24…

MALICIOUS

PDF

79.0 KB Created: 2021-08-11 07:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d85057ede90233c86ac026a52b1ad86e SHA-1: aaabb906faa1267f9b86feebae2bd298a9b6b746 SHA-256: e453ac1683ea6f245c59c5a9ffc111b25e19b1014c9a635a37c3285de4e341d8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or track clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://wskinbody.com/data/boardData/files/49291103228.pdf In PDF document text
    • https://alatheir.com/atheirwsfiles/file/4360612274.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd87faa3ddb---sezulatasusuxibu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3df178a434b088d52d5f93489b45dbc7/10360754657.pdfIn PDF document text
    • http://fteq.ru/files/file/68070226483.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607866d9652ee---46489350227.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/jelumexuzagawogubalor.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/nonewiv.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dcba46664---29550901381.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xabukipawetewexex.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468ecb9f7e---83111053175.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/38fafd793dfd6020d788c93ae9d508ee/13623380659.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273adc27b7---sesine.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b9e7f01abbce4a96b848117e0597c9c7/51971103599.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1b20099d88fed374cc8cb7eac22e9d83/wadeg.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/nq2g3j4rdphfp7rqc7790dmubb/dimujamisomolodanep.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/banowabupafasefax.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h4dvrd8qc7rondrglqjd2v70u7/76913070225.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/fuworoletedusoxotiresoxo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/midewurunirixu.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/71543199777.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5956e54ff4dfd415a4c4dccc0aa6cc25/75919503978.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/22386937821.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f4c83de691a842ed8467e535e0179731/lavowebokerapivuzazin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=las+batallas+en+el+desierto+jos%C3%A9+emilio+pacheco+pdfPDF 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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 11264 bytes
SHA-256: 68c0d0905a39aec19b2f83e6281dee76b194cf7e7eb97e44ae75edf99d7a2fb8
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 18164 bytes
SHA-256: ad2746ddd7334e19aeaba575474881f654cf671cd5f473512c2997a5a8eb5f5f
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1