Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcbcebc6f80e2ec…

MALICIOUS

PDF

118.8 KB Created: 2021-07-15 09:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da5d37037dff786945da8b7d19795883 SHA-1: 6528cce5d8985a848983f0a6c5b680673bf1d7c3 SHA-256: edcbcebc6f80e2ec444c0b3d0449078b2e42180fa2fba2ce73087ae3303fadcf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_MFA_LURE' reveals the document's intent to harvest credentials by requesting MFA approval or one-time codes. Multiple URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing infrastructure designed to host and distribute malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://status-go.net/gfx/userfiles/files/tasosavesunogakunakar.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b632ef17c7e---1982284498.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/297814051.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/r6hjj8jragu5vjq8ilpeha2h1e/39693324133.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/tokavuwekorumuwik.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070bab4e2488---16919863213.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/514f25fa4646466807d1a64249dd0187/tapijam.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/16255252460.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t8birikuj1f9ku9mst2lturas3/75902570741.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffd756f9a---99273353910.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/wonenixanatisexisadija.pdfIn PDF document text
    • http://ozari-ua.com/files/file/sodozilufanedexurife.pdfIn PDF document text
    • https://kartplast.com/resimler/files/dinijadububet.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7aa9b64b---taluda.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zabasilupajifiw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa57146c4a3---91622381363.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubawalowasumogigulam.pdfIn PDF document text
    • http://cocoal.com/uploads/file/43992054809.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/13483701659.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/duretapif.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae344408fae---jajegovexukewepalidejazo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a09cece4---10525333796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manual+ip+settings+for+xbox+360PDF 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_off00016aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000182b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B7 18600 bytes
SHA-256: 2cb5ef3d9e06fdda00d0ca28e6b5e3332901d7a9bac3af880d1acc9694b3fd12
font_02_sfnt_off0001b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B374 11328 bytes
SHA-256: 7b59ec96ed4607da6d902cc4d573b22929be16810be02cd5c318c50c46293852

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