Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0de64dca3601fa…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b7f526d37a7edf403aa9f06dbbefc3b2 SHA-1: 9114f60f8469f1276f2a8c3e5bb0aa831192f482 SHA-256: da0de64dca3601fa2049afdd58adcd661e370ff0cc9719eb393cae55f1f6d80a
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. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' parameters in some URLs further supports the idea of a campaign to drive traffic for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=efootball+pes+2019+apk+download PDF link annotation
    • https://flyags.com/editorResources/file///6053211941.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/43198335569.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/javiwerubasobanigenasikim.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/tifobubafewinu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/775cb56ec9b101781a4f96492b9960f9/5391168669.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xujokajadapirubu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/732e601357fe22b42c4cb572adb04a00/vavepazopobisifutumefove.pdfIn PDF document text
    • http://falerisztika.hu/tmp/49160339851.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/58053107544.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sobuvilojuxarigove.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/boruzuzumisujeremubavagiw.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/pigodunemupusawidaliviken.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lovajesejosuboki.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/welamoxoxubibedanifufos.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/63679680798.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/28494262834.pdfIn PDF document text
    • http://gardatrans.com/content/Files/9097920207.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161334f2a0188f---98600975091.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/94984698653.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/ruwovuvaletexa.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/50541212042.pdfIn PDF document text
    • http://amandamaitland.com/images/file/62059035214.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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 11064 bytes
SHA-256: f9396576ac22e52332b0b481bfe47682948dd3ae566a76e6a4750fec6a46249d
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 17920 bytes
SHA-256: 246d34cf0adac6aefa5b7026ea2a481862eba2e9e4f0dd49d5d66784e0a0b655
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1