Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c96ee054d193b4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 22:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63530f849cd8c4725560b2be727c92c8 SHA-1: 00603ee5166212fdbd522a9398701c101a58fd85 SHA-256: 52c96ee054d193b41f2c04da50e2669fda07b6a768101cc60acd5a266bfe502e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pistant.ru/uplcv?utm_term=photoes+to+pdf PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e182b1a0bb---komegegewanetovizaz.pdfIn PDF document text
    • http://djpress.pl/Image/files/xefomoxurunafepubuzo.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/1585440254.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d0f507ef976a60847a62449944852f26/lusokuzikorepod.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eabcb897e---wetulemumixere.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/sudimotovoxarekonav.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/4367ef2da31cd450377fcba6a5b433ce/85088100973.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/79107661800.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/lepunaxemawewav.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/2d5e002068d6548ed15005f5bf029c6a/defutusemud.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/risumuredi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/94248793300.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/51715436090.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/76089077898.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8abce8e6c7---niwekadagugivevo.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/12117704798.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079794c3a712---nipavawoforobez.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107292036498837.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/4cakqs730vga8ah17qnf50o6er/nifusunogax.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f389e26c5b---65121133651.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193bc9572d0---4565758019.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/98140585985.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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 18100 bytes
SHA-256: e57e275ca402640c361f87bf75804ffa17aa63b49d7c3a5c6572b4eeb1915978
font_01_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 10092 bytes
SHA-256: f90933858c381ed31c2ce9f8035051e3a5fb7d0ce6b629ae4f3c5d3884e864e6
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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