Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf51df4d98a9700c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 23:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 656f3f5986c92b3e7f4705ee960b4f86 SHA-1: b3af2d93f6f8e9506f6c353f59b3f5ccccfaed3d SHA-256: bf51df4d98a9700c27110b1dc1e588873413f06a0a3b0e5e4a1a0eaa4f570f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of a link farm suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://fertilizergranulatorprice.com/d/files/vadurenijelazilo.pdf In PDF document text
    • http://youngshiny.com/userfiles/file/1626960154.pdfIn PDF document text
    • https://clinicscrm.com/img/files/16343951184.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b46ecbf5---fetezasegenavobap.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/vosazozixijolaxopojiwibu.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/83618815347.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/jabunuzatoziregubupitim.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c3fa6f69f8c14461ba60d44fc7ef951a/tevagudegevisefage.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/nco6m6u3itf265un6jpp4r3t2p/57028438642.pdfIn PDF document text
    • http://asfalon.com/__files/file/danixulusenego.pdfIn PDF document text
    • https://best-label.com/upload/files/pusuxujamari.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/fulerazodawovizejozadajex.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/30993664364.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/nudenijiroximuj.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/79303923924.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/87847611157.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/xerujubewigenodato.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b077e068---ronozupubusetekutusa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4ae39ef4---73285066969.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/livorifewisafolemuvuxo.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/57791053813.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/27105636399.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/kipajilivoxusamobobaz.pdfIn PDF document text
    • http://flexa.cz/docs/file/pumevudavoxov.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609400a992322---dafamaxubobegix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=esquema+de+mayor+pdfPDF 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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 15228 bytes
SHA-256: 379f3fc744265d263ea9192c7349cd5f38a46ecbab3f87593ce99d51795518a1
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10660 bytes
SHA-256: bf4a6e3ccf2ec4f3286869518dff40432e83baf90e4c1d353bbcaa55d1378729

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