Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a344092bd2ff2a…

MALICIOUS

PDF

81.4 KB Created: 2021-07-02 23:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9b7a80e423c44cbf9d1d61c754fe3ec SHA-1: ebe0417a12e88132058d82f01565b9fde2c27d46 SHA-256: 55a344092bd2ff2a4838c2680cad9bc886d77f0ed9cb9f4822fdf1653b6f6baa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://cz-synergy.cz/data/file/mukerotemenuliz.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u9r8v804e7fnmg6ttf66cprgn0/50103729264.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5fa4f544---67139210712.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9de9toehdfq495g80dftnp3b6e/8751179330.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94e12bb59---9212527163.pdf
    • http://www.stemcellhairclinic.com/files/files/woligoxutaxuvot.pdf
    • http://alnadaoil.com/userfiles/file/korax.pdf
    • http://border-inn.com/CKEdit/upload/files/79764792205.pdf
    • https://pasarantogeldua.com/contents//files/jaxer.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/m405srd2toqvedt34abuu97in1/dowuwowugalatekesewexig.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e2331b73---pitodupid.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4420ba50---nolomisag.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/686e171bef1f15355be3ef538ee93689/27749816882.pdf
    • https://anmoul.com/userfiles/file/zusizituvamidumolurovi.pdf
    • http://provia-events.de/pics/fotos/1/file/74601619178.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4c657ebefd8196247e4274fa327b30e0/53590203040.pdf
    • http://ottotech.center/userfiles/file/58832329912.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd2f22494d---13907007416.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5127b88a06---80182428558.pdf
    • http://mistralizmiryonetim.com/uploads/file/jisozoti.pdf
    • http://taxicityplus.ru/userfiles/file/55413779078.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d2468f66c01---bufuvoboxunarekolafodezu.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160714458b38cc---redapejakuxewosejaxib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+combine+two+pdf+files+to+one
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 16792 bytes
font_01_sfnt_off0000f4dc.bin
aedf8133dcc2c4cc65c9156b005c4d1ae331002366d4d541485b4f84ab726e73
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10736 bytes
font_02_sfnt_off00010d46.bin
37123ee0e9c13bc23406c802d6f9528c85ff5fc375a574c1313bb35a3c3548e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16452 bytes