Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73f0fe9a42e6296…

MALICIOUS

PDF

71.2 KB Created: 2021-09-14 04:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f4afc928988e3898630cc46dd763e6a SHA-1: 5bc391d512109e19715082a5030312de66ba6f0e SHA-256: a73f0fe9a42e6296575d0a93bad61b7accf046cb14f2732e0cf6b81147f0d883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS upload directories or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=clipboard+on+my+phone+where+is+it PDF link annotation
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb326dbaff---jugibepu.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/54922183152.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/34897910012.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/83652994200.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7ae6gpln3hq6iljdjivsnagvj7/juzosoxijagajipe.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-01/189bd22f7bae7799816033d84f43be76.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/nukopiz.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jesaxobumurezajupod.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109030803129190.pdfIn PDF document text
    • https://okazionche.com/files/53475899619.pdfIn PDF document text
    • http://cold.lt/userfiles/file/gasiwesovufidetuk.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/99810148723.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/53335079590.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/80934757707.pdfIn PDF document text
    • http://355353.ru/userfiles/file/69161598350.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/93310214840.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/zufimopuvovobetosib.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf005035a---3881513620.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/datuxoji.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/vinakilededarobovabar.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/voguvij.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/gimakorukatamipozinan.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffacfd8b53---50042684932.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_off0000b6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 11028 bytes
SHA-256: d7d78b98ae1208b0a794140623d5debe756a5c8101f3bad7ee269b9fe833487f
font_02_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 15400 bytes
SHA-256: 97837ae17e251fdbc0b27aa62a4a940d9e1cbff43931418a985b286c8702a2bd