Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75936d48934da43…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 15:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6a0e602455644121f5e5b8e51bfc621 SHA-1: 66c005ec822d7e22457cb6e94921f9da1ed5ef1b SHA-256: e75936d48934da432ec1caf3cfd0022e28cd2218a8942180381c0cb83e6e0cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://coretry.ru/uplcv?utm_term=new+hack+pubg+mobile+ios+2020 PDF link annotation
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3cd5b197d2bdd2bdd4d3c2f4fa8dff97/98855011776.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/020fe59eb4b7e75a9b0c78fe3400d1e5/74754754261.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/guboxabeli.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/74630867393.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/99934752086.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dinutuzepufesemori.pdfIn PDF document text
    • https://afayl.com/userfiles/file/68057210771.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd9e6cb111---46316356338.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607443027d0f1---dubavexizu.pdfIn PDF document text
    • http://www.polni.si/Images/files/24578728738.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/gp0mhkm10j2f6blgdae2hl4q86/kiriwitox.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f6e8c836c0802a5a9c5f6e6123c3890c/84444973000.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/gexanotiko.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/413081297637cc4b2c640c8019da671c/17676806113.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fekagigikokuxasudexujafi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8d5e47ecc0bb4034ea835762e19f6d15/13982570667.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/80856654276.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b112c4203---6540530376.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1obaekvj24vj80cdtsud9blh2l/61645010693.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c331d2bcd04---62814086558.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608808c5484fd---bavegixovizojotaz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3e8a9084---68441357711.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bizuzalirijabixol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 16640 bytes
SHA-256: 10c8e74dc42f475134062aac0c4fc06332edaae15aaca580926cba7e90d9ee85
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 16728 bytes
SHA-256: 889b775d2bed7a198eb0d7b8641453463a8788c14bed65f948a3cbbb84c23231
font_02_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 11156 bytes
SHA-256: 9b578f26b91df6b4ad00252b7b29d43eb3e58f81b238d6f8dc7878922e6e5c70
font_03_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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