Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f365badaa1fa3dc…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 06:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7725e2fddc4539df6b90179d3efc2bdd SHA-1: b21845e754acaa279b4b95306ccd37354ec7cf68 SHA-256: 0f365badaa1fa3dc1ebdf7120801ee80581717e7991580fe89004592ce1bcfa4
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=sheet+metal+die+design+pdf PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6584fdf5f0b69bd9a0c23b594cc2617d/demozedavogixewurob.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/wetijatavopiwepixul.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/68993651997.pdfIn PDF document text
    • https://digireg.nz/upload/kefebasagam.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/72583517703.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zamixol.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/98040189547.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607487bd25fe2---dugopuxafa.pdfIn PDF document text
    • https://wagaskar.com/media/vevutivagekoke.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/50681656026.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/99773945207.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/nutofiximu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/57010450947.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/83f2dc987cfb21d30825afd6c60f1d77/divilazigekefi.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/47863671820.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cc6faec3c---98552395845.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/28666134583.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/0e435f2fa79639ae91951165bbd34f07/gevojudegukixirijosunujas.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/fezizomomoxebibe.pdfIn PDF document text
    • https://maturana.cl/upload/file/521358149.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vexubemilugigazev.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_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10800 bytes
SHA-256: 527313e961e283117c2ef329c4a1c07deba1570991cf045ea29996c843ed8b11
font_02_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 17696 bytes
SHA-256: b8b07bab0885360f1dd66d0e8bb95655107c30c98b7ad1cd16576949e51e67bc

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