Malicious PDF — malware analysis report

Static analysis result for SHA-256 711e1d340f393258…

MALICIOUS

PDF

87.4 KB Created: 2021-08-22 01:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a0b184b5499a8fd9a2173b2921601d2 SHA-1: f8af97b64a9febf9582558221e4cc84794b10e31 SHA-256: 711e1d340f393258e1f35fb51a70714013ce24735f21f81e87432cc37e783e6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate it is part of a link farm hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/18dad9067b4ba9aa078b19a310ae7e23/94199754779.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b0fcc763ce3aca25efa5d7f579325e12/44004420113.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/denemojuzitawizelenibu.pdfIn PDF document text
    • http://aplus.to/userfiles/file/26092799923.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/26355683098.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n2j9ef6ggun95h8e4df2da2sf4/18098066935.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/64463555389.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/zoliso.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/chrsskr9avij60vcsb9kkdg291/zugumuvekaxozaxi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da05da958---poromesimafutadovizomud.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/34452582819.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607688744e006---dewumurup.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/37506188435.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/84744673189.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/000d833ac7337f9851ecdf6a80ce2d4f/bakonofon.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/fubad.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611155e0dbfc2---73496144832.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/62775666423.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a52487d559c7a7393f63b1900b2291e/84845526042.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/penukomirokogatumerabu.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/tujojezi.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/70533159000.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/76190482055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+main+teachings+of+confucianism+daoism+and+legalismPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 18304 bytes
SHA-256: 3af9052331e224e1658332daa64edd7b2f5e5153cc3f28a9e2394043edbc0b88
font_01_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 2728 bytes
SHA-256: d106d2848a29aab3a72bd6972ca53ed328176a45042b24df2c6f1ab5b339d274
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 11016 bytes
SHA-256: d1d9599ebda979730467dd340389be5686965ea6cc2c75387a292c77cca8d065

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