Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3bfeabd50f080a…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 09:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad954ddb32f9689a69f20c4a5cef2f6d SHA-1: f23a521d22d2efa1c795618cfd4f130063865809 SHA-256: 4e3bfeabd50f080ae4f73fc93f2b3a9cf728715c635f75397069e468a0b61b48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The SE_INVOICE_LURE heuristic suggests the document's content is designed to trick users into clicking these malicious links, likely to download a secondary payload. No scripts were extracted, but the presence of multiple links to potentially malicious PDF files indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9377090a2---talilawulitadamon.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/152e004e1b9871a778f517cc09614887/96084020437.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6148504e---15490985232.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bfc632a7a77e8042253c9e53b6577b1d/fedagegatigiganadibot.pdf
    • http://danfilenemd.com/clients/67744/File/pokufejudelavudokerimegek.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b86493d3a70---xojuxigotafifaf.pdf
    • https://bocion.com/ckfinder/userfiles/files/81066643288.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ce017b2ab980ddb7748759263ec9d7b9/8003263168.pdf
    • http://fashioneducation.ru/userfiles/file/mozawurul.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/nonazavezuxuwipesax.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7ce111269eb38ac71405983bb5d54101/93014484117.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/69063f206a5ece2cddb464c84468db0a/16494283433.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17528992188.pdf
    • http://geredekombiservisi.com/userfiles/file/76113621817.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/83e2c2c6636c35e5b3fc9d853cd88c8f/85152266487.pdf
    • http://bright-inter.com/file_media/file_image/file/livatabivevubuzajupujaden.pdf
    • http://constantemails.com/userfiles/file/162508566981568064823.pdf
    • http://lycee-elm.org/userfiles/file/nupexirutobetufozojapi.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/baf35ad574bdbcc42fa04eca81c79f01/gagirenukedaz.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed4175312459b9c517ae3907ef3e4518/47581145524.pdf
    • http://xiaohecollege.com/d/files/rozijolesapafa.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3894ee4e.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ba22664d---18290637758.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+possible+dso
    • 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_off0000ee33.bin
e891e9fd84dd7e440e869815cd687080e0446640fb526455657e84fe1b1b2ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 17712 bytes
font_01_sfnt_off00011c80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 16792 bytes
font_02_sfnt_off00013497.bin
fcbe7c2a3f564da2c286cbb407dcc3fb719f76886885ac192fccf783ce32055b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 10212 bytes