Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37b8b7a9ce3f5e1…

MALICIOUS

PDF

91.1 KB Created: 2021-07-06 15:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f3cef1c2798c3dc7fe0f0e3836e2f75 SHA-1: 240d01afa06e1dbbb58451685497be424fba42c3 SHA-256: a37b8b7a9ce3f5e141427128f844ffa9521bd1cfef7bcf9ebb3cbe40e941f8ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to compromised websites, including those hosted on disposable domains and WordPress upload directories. The presence of external URIs and link farms suggests a phishing or malware distribution attempt, likely leveraging a PDF exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ketchas.ru/uplcv?utm_term=life+is+what+you+make+it+pdf+free
    • http://www.predia.cz/userfiles/file/kamuxutumilejuzivibuxewug.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3b76512d---3147664356.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ropovezaluxolijig.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac111539fb3---rubozapoxogofolexut.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a487f2108---25597471260.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/fapdmfodnqasrp0ugal8ju49ng/17817402437.pdf
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/74008552566.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b01af32be1f---dukelege.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/upj616klcqrmnia8eevd7t6r2c/daketaxewopurebebulanot.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37011cb058---76501966639.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607991aa53321---20676386005.pdf
    • https://moscowfashion.net/content/xuploadimages/file/95349505705.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3c60d824---forefuxatibiwoj.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/9be315a61da09f921a291ca9dccbc39b/devipepogepegobidug.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160918a40ba87b---dolofewetugitenamovaze.pdf
    • http://bsbcarpet.com/userfiles/file/64622512404.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3f4c1da492a31c8d044102fe271493c1/relozixux.pdf
    • https://skiclubraonbaccarat.fr/pdf/giwilipefarasafedatuf.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a7a65239d2a4664effd7e55c40d6147f/divusag.pdf
    • https://x-software.cz/data/file/26900681421.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/1cdv5vi5pbo0jf5i2jfb4jk9i6/kowipituwonow.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0429940234---bofatamupejibex.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607992c27ca51---23447422828.pdf
    • https://aluminiosarla.com/userfiles_arla/files/giwefurolulujevel.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c3b91c12---84273547948.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdc276713a5f946b17f88fbf1ae56f31/94711072046.pdf
    • http://dongphuctqueen.com/upload/files/nobezamukam.pdf
    • 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_off000100cf.bin
76d89f8410425db3cd39138796e279f65cea4722d8b0eb5f972ac44a59e2af26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 17140 bytes
font_01_sfnt_off00012d5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
font_02_sfnt_off00014573.bin
3e983306e5cb6c974655ba37a308603a40ece91a69ba2053dc9cc6be45181666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 10960 bytes

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