Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de316f83a380fc2…

MALICIOUS

PDF

85.3 KB Created: 2021-08-21 14:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8e9a1f0eef3eab67ec81b59d5ff75188 SHA-1: ee367c686bb565e90f8e9eca8e5792765f284674 SHA-256: 5de316f83a380fc2eb7eea1a10578306b20cf2d32e9060ec8dbbe78f08190ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dc09d99f7412bd6fcd26377ffc84cd6f/xodevarunegegidisujodaku.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/57et5fd619p52lufe7jggtir37/92049021967.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/lazitaxafixudup.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/32496046696.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/47380172642.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609979cf68b5c---35038157254.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae08e2d3e---pedumumerinasipomumebulax.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ba863f5b---wopakafizozizixu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/90058859927.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/65645692592.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d78438d5a8f64fa4e3909d7ee2607499/lefusukofapiboneka.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed278bee7d726d31cbd4a0606322b86a/jezik.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/22430305802.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/62737626440.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078ffd4780d4---20865325724.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/79405739544.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/nekorixilijefilidadofit.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/wugajebirutumowomatafew.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/mke3l7ebuvli00prb0mv5co88m/9855351761.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e0834d19b---kuguxiropemutebo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/04139387a2ecfcc5a17222b540b9e5cc/84943369844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+know+what+size+your+gucci+belt+isPDF 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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16532 bytes
SHA-256: fdb4d3d56eabff2d3d42974e0ccc37b35cc18b28f68742aa2576d29f5866f86d
font_01_sfnt_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 11092 bytes
SHA-256: f039be731b443118a4da35cd063f4d7b8dc0a6d719a5f0d83b85c6b2a39687a0
font_02_sfnt_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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