Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58149e1ab3e4eab…

MALICIOUS

PDF

85.4 KB Created: 2021-08-13 05:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91267ace75ae0ed56f5cacd5914786f7 SHA-1: decc548f53cbe3eb693678684a7df258f89067f4 SHA-256: b58149e1ab3e4eab40d5a982d19240db361bd6e5596b88ae91875c4ed163382f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicate the document is designed to redirect users to potentially malicious content hosted on various domains, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oniceh.ru/uplcv?utm_term=how+do+you+say+please+find+attached PDF link annotation
    • http://juha.be/_files/file/rigupivenixevig.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/fejanufubokikolozekogon.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088caa68e83e---28753709539.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oagq6pdobli0pb82a5qlrdphi4/lonugapixiveferuxoxe.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/ruxuwinatarafidavidone.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/6577405553.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/26429692539.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/7005362137.pdfIn PDF document text
    • http://rts-3.ru/upload/files/24181816077.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0e1c8a32---52022083602.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/kavusupagubinox.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a3590154---jatifapup.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/1835823825.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/15608210485.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf203c69b3e---61264784030.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/v6c60i18dnm7556veg7ilt1ljv/50824712040.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202187050274720.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be683ae40---vuwisiw.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/49509247786.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c10c45244---45287546815.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ba34aec---31614706408.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/buvikimatif.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/buxerixipuk.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_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 17384 bytes
SHA-256: 976f17ba52fca3b66683792eefee603ff6610991cd51718c7f6c1a9dc50c0a81
font_01_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 10908 bytes
SHA-256: c91e340a2cdafafe97537037134fb95fddb720f3fff324cf6500b500d4aa1a81
font_02_sfnt_off00012fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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