Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a45350532cefa73…

MALICIOUS

PDF

88.0 KB Created: 2021-08-18 18:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4033fc91e36844a0a0162a7ce1e0132 SHA-1: 1b00f9991eeb92b6f0be4bd45bb376ad9fa1d7d2 SHA-256: 9a45350532cefa7306f46a4ef4a3dc3a9534cacebdbf4c361a7700b679943aa4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of a heuristic indicating instructions to disable security software further supports a malicious intent. Although no scripts were directly extracted, the overall structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://cructi.ru/uplcv?utm_term=marvel%27s+spider+man+download+%2B+full+game+crack+for+free PDF link annotation
    • http://scuolascifondocortinadolomiti.it/userfiles/files/98332229410.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f3417bae87f014cb173df4cef18605d7/solebid.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/6121122931.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6feb5b53d---22754909725.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/6617836156.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a82f59a91299c78195db52c243560aaa/teperinazikerolupikow.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2fdc5e1ca---lazusuropozefivonu.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/bodulozawimexi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6urhn17f4tjcmu5ccl1stc1f94/64381280418.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/77344595745.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/70065016166.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162570308334.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116b49069c94---zabobodijalu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad306a03a0---81769845676.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sugibuboxiladam.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/28842432758.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd796919a---93773526008.pdfIn PDF document text
    • http://e-hane.com/files/xizetomuwotol.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6285022ed0d47c1e05e05bc0e7bd0f5c/simafofowo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/22bfdc7f323d76bbbc45219ef78ca63b/84028293964.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f894bd4a855---jorafosogovobuxavawaxux.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e5f003f761a0e16bd85d569cc32cdd51/vuwajosarakekexu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d0f9a5173---57352893984.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1c8f662af374275a2f99d523d1046da6/67050595648.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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 11236 bytes
SHA-256: ec57fbf3f793e2e6443e8e91142aa9bf3f316c7561339434a56031aed68c4bdb
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 17768 bytes
SHA-256: e2288fe0b8a003d122759c1a96e91b1341ad88838fb34e06b5b26810eda2a25f

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