Malicious PDF — malware analysis report

Static analysis result for SHA-256 b276842998d55fc1…

MALICIOUS

PDF

99.7 KB Created: 2021-07-18 12:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ed90b49e5846dc276c621dc10ccc5b2a SHA-1: d6f12c6b4a3cddb7b25d0abcfc6b38b0f2f7a831 SHA-256: b276842998d55fc10e0ae438a7256f510f1c11d06f3a72531d411fc143ad1318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077d50d9e1d1---75172010904.pdf In PDF document text
    • https://tipresentoio.it/images/file/kujofufekamagigit.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/9319287243.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087d76423f38---53530764613.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/zumelobofa.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bc483ef7---zilipexadufozuvojo.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e300b5fc697ba25a1031cd8e5a0ee492/nenuredakerugiwadijuto.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/teduzatobaxopumasen.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12efa6af8---68442021155.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/afc2d7137610d129200c4740def75164/gomazibekumozudugonabedun.pdfIn PDF document text
    • https://kham.vn/userfiles/file/wilimilozelobasizoduzurud.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rjdfknb6tjhshapclj167roqj6/netan.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/jezigewemudobubajirotufe.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/60994282859.pdfIn PDF document text
    • http://108homed.com/userfiles/files/62880018633.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/6732748052.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/xulotavutolukurisawesinaf.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6295b697a9c0a54a0275dfcbaa64ae12/21508375034.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9sljhkoqel48c5m8kvj0kng6k2/degakojijogowujako.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/11235095665.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43da6a85db---jufifotarojunuv.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856acd72b39---feboxoguzitexeponival.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/fijugomumevajuva.pdfIn PDF document text
    • https://5uempat.com/contents//files/28767908238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=world%27s+largest+selling+biscuit+2020PDF 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_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 18080 bytes
SHA-256: 0a0b6d090a65168ee2e044fc1e57bc08ef3b5a67f6e3fbdb8ec814b696b2d505
font_01_sfnt_off00014f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F89 11056 bytes
SHA-256: 17504c0760b25e242f3c4ff6e488754e61f092e91b1434c673515e8ae4b0f508
font_02_sfnt_off00016945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1