Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c558ce09a874b…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 09:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f1d9307c5e61c629b507e1a8c8a5e87 SHA-1: b4851e6f1a1fa51f81b82f88d5aefc6d7d8c1160 SHA-256: c58c558ce09a874b18b0fc956582220f4aab6c3583d8a6c46680b1aaa5aef67a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous links pointing to compromised WordPress sites, likely serving as a distribution mechanism for phishing or malware. The embedded URLs suggest a redirection strategy to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://archism.ru/uplcv?utm_term=bts+life+goes+on+piano+notes+letters PDF link annotation
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4ti50elfvjvj8gs6lvap5ivddd/soletigokobatajin.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607883340b1ca---ledezowaxob.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d40c77cf---pisefizavowex.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1fda7ab07c8922d7bb65275ffde5429d/49890279750.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mujobufumobemiwofaxiwof.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/l5f1hp2meu7r2l9jbuc6nrj160/gefapobuxugazit.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4de046d29d98398afd98b313066a77ca/lowurefojekowibodeni.pdfIn PDF document text
    • http://abnicum.com/files/file/53560035165.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/66bf6e7932e37f29cd645750df2aa028/kaduzatoriju.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/ralipepito.pdfIn PDF document text
    • http://prestopc.it/upload/file/kipovij.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/jamolasolonuxom.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/galifozajiruxu.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215101859504680.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/56640978515.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928f1eb07ed---vudujumixen.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zetidufolalusoxotubaroden.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0s84pmuqpa3ksvvknc6k8ht5te/12073723450.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/v1icn86nfkakc2mg1qmlfr7qm7/74680036212.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b95a898960f5234f0fc834a1c754687a/xazawetimizebete.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb6f8704a2---24338009616.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5cc9a076---nopuzonivubasowakemof.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 10584 bytes
SHA-256: 1db92e98d99695d4581d3594d4f3ac6b166e672399689f2ab270f645a2d26651
font_02_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 16564 bytes
SHA-256: d286eaa0a7a459d2e3cf832c94c1e41deba9cc5f0aee6f692c89754a054ebf6e
font_03_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 18220 bytes
SHA-256: a8c9c46ee8444ef5b6702b5776d65402521d61611501a9afa3d6ca2b24ebc0ec

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