Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4e182500720a1b…

MALICIOUS

PDF

84.6 KB Created: 2021-08-04 01:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a061d43f9c9c663dca468f3c6d0dfee SHA-1: 31ea8a552a295918f2d68e24dee1bb8b4a16f076 SHA-256: fc4e182500720a1b055a6872e2a2c53415a15e5f624577463badaa9a49f1133d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://smidgel.ru/uplcv?utm_term=escala+de+silverman+anderson+gpc PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/00127277a51db39ba72f2a6ad93cb555/dusenizireviburitisaju.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f704af13---67802091176.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/vibafufolubejesate.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/83975254870.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/78628020737.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/sikofegeximetakiji.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69072061cb---lasolexagefevawus.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14e283b49---sobopisuxo.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/1850236661.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/22e740c1402f9a690ab5360bd3f6200b/ludoxizosefejutozozo.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210801005849_414155019.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a934d80a8c5---lagadudejod.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/vilozetagotofogaxosademu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/20094535086.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce8bbf95b---lasopexosidimilemon.pdfIn PDF document text
    • http://maidichike.com/upload/files/lefevenetul.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/luzedepezokavodivo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bdn2f66moln51nd2j36om4o3re/89699220087.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b79461614---62674432540.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/69217737267.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0891208dd245ccd5549dc80801b7ba54/10911366732.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f740c0e2838---32862718706.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dawodujubof.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 10808 bytes
SHA-256: f65a5a072dac2c397c161443e74d60f0494ffb4e454abb643a832383c17cfaf3
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 17532 bytes
SHA-256: e7120aa8548163c0477a778b4a13bd395593287f0b1c4336b6fd4f50b294dc7a
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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