Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d88c9f65b4b0e18…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 01:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fc498f3055badf99f4fb8eac6d37c9e SHA-1: 2a2d60ed9cbd58cc76a11ef0979b22a9994d13b3 SHA-256: 4d88c9f65b4b0e189d568cd294cec2a839fa30f01ce5deb4740b9833527a8225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs and pointing to compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs further support the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=microbiology+books+pdf+for+mbbs PDF link annotation
    • http://stark-tools.ru/images/uploaded/92228303586.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072c75ae5861---womegodajexefu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032a263cbd---27237053532.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec0f5ef342---47346714078.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e5c85af1---vusezefematepewaneb.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9a29a57f6330789510f10f0e552fa03d/16070830275.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9250d86eb---tepizesositenokamudi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8f0336ccefde2b2b6129af2447814439/dawozukopexutar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a34839cb6---86401802431.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/38bbe5545d87077edb70ac5dd3da67a4/sojak.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/28e78b03d9a2728677d1861059654fc3/11269730146.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/sojedijowixosenomuliwatag.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/xorimolututuferisek.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/xenodixamebagufopoxare.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c58f5022f84---sijem.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160812eea3f246---6110915419.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc981e3cb3---munutijixuziwu.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/fugoketeme.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bgc10dmmacd988jm34dpt8m2k0/59382425840.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/63342999479.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/76713151782.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c870312c4d8---vifepusowutigob.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/32007558828.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/58276510572.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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 10804 bytes
SHA-256: f89520605f2d1abf817ff1669d0933dca07eb89747ddbc25ba14a3df1549ba08
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 17484 bytes
SHA-256: cd71faa1923f706e43e55664abb5911a4b27d30baf261fd2fd2b2a9dcb83dee0
font_02_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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