Malicious PDF — malware analysis report

Static analysis result for SHA-256 58eb613e7a2522a6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 22:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f3cc82d7fe899bcb4998b8498f366d2 SHA-1: e38a0b4309586aef94c9fee0f2309d33cec11205 SHA-256: 58eb613e7a2522a6bb2195b2d118e89f470d17ac55210d106c179a251a93d370
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised or disposable domains, indicating a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tunguoilon.tunhua.vn/ipp/images/uploads/files/felediwobedobuwadoju.pdf In PDF document text
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8567455207.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/24652594216.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///87959676550.pdfIn PDF document text
    • http://client.diffuse.info/files/75701858306.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xirilusawifafubenugupa.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wojovoguzidagese.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/juvexi.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/59026401717.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/kelamagaxubovojijofigapo.pdfIn PDF document text
    • http://mobiliteit.nu/files/48511744015.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131f44c4babb---mulikavalefifugileguk.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/lepavoxigulimipa.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/87397773467.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/gumiverosezeb.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/62503706257.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/6401340018.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/sazixovonomudawabem.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/3306394150.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dca9655dd---mosorexivum.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/67521880206.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/70312717872.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/678b7735e2f9f760567ec5f7cee247b1/tufudanebuwapujewisawu.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/getinosiwobuxos.pdfIn PDF document text
    • http://cabini.it/userfiles/files/34501495130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=auto+liker+1000+likes+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 17580 bytes
SHA-256: 5b8f38827e3c964bab4334d0f54f611ba01739bca58d418e85910e7084f85219
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10488 bytes
SHA-256: 4e6a968c224bddedc63a439e78a893e6c10092892619e738cec75179929b5208
font_02_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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