Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c5442712f98ad0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 05:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9c63ff7eb00f29796068ac26dbafa7a SHA-1: a0dcd8b22d6f8c0f18ac804e1ee7da009bee990a SHA-256: 08c5442712f98ad060739d0f7a0e883f8fa2100761c08c18904bd78fd47af57e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This pattern is commonly used for phishing or to redirect users to sites that host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://singer-island-condos.com/userfiles/files/zimeteduvosonirajopezo.pdf In PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908132023279118.pdfIn PDF document text
    • https://btegypt.com/file/tetorexivubeziborewe.pdfIn PDF document text
    • https://atiksigorta.com/files/62632000052.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bopube.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/sujixupodefanepojesu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lv573molrs7o3d7dotqm31jaj4/favitapujonowebeforuw.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/xowofatevagifazemusunena.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9edabd461b103a2265b4e85d460b65e7/41464185138.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sobotulijoxavezogi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cbe97a6a---nabuguvuwatepunifaxofeze.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/tutizemozadiwuges.pdfIn PDF document text
    • http://mp-journal.com/media/file/jitolizufe.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f24373ad---vofike.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/wuligozumedasovil.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/85687483025.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/zisero.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/vifugebixe.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/36228882964.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/293897866.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020434446817.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/pimafuda.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/061121426357.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sonixepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+printing+black+boxesPDF 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_off0000c1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BC 17248 bytes
SHA-256: 193c490f933c8e1863cab22e5fd25ccdc20f8ac32066eb86cc57a444d8ece34d
font_01_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 11132 bytes
SHA-256: 8985a867bb07d3c672b996ef30f7415a35849cf6b9d846ef47eeeb0930516510

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