Malicious PDF — malware analysis report

Static analysis result for SHA-256 254836278aef4331…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 02:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3481756e53fb2e051e6a55b3fd21472 SHA-1: 77788359581e1bbea6f4b25adea9762c30e43df3 SHA-256: 254836278aef4331d58ba9ad08d1667441e80b9a9487d5bb876431ebc524972e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The primary attack pattern involves luring users to malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072c893c8c70---32346287559.pdf In PDF document text
    • http://alvirne88.com/clients/71477/File/32613368214.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1e75290c---mibol.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/829aafa0e0c11cbf723d390aa12d5f68/54251264378.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/jagotonelesiboxu.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/62912726892.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/22474794249.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jabufajozasusilejabidifi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2df3d29d9---lekipigu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060112591738.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/22207167187.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/90080727462.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/segobasewavujeguzok.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/95552967072.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798eb3e464a---zodikulifiduxagafotaxi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470323dd73---12768955287.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/17157180228.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/36281959274.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2777e8c72d---zigirupebunolasebiradipi.pdfIn PDF document text
    • https://cooperspick.com/files/10475103569.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59185519548.pdfIn PDF document text
    • https://jotelek.hu/files/file/naraxuti.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba62ade2c7---zadigasoxowe.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/vebesozalejemojizug.pdfIn PDF document text
    • http://446888.top/userfiles/file/37141932737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=excavation+bengali+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 17100 bytes
SHA-256: af6352c6d9b0e605407c38fa74e817a8d81e4c92f12c4f8e92d0996264b0d156
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 17548 bytes
SHA-256: 3f9574520b8cd84c81e78781a0585d2f707daa2507e138deb1751b141a88db55
font_02_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 10596 bytes
SHA-256: 4144fcfa31e564060def40434c92f57cc881474ecdaa99076479f05842ede653
font_03_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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