Malicious PDF — malware analysis report

Static analysis result for SHA-256 285534ef9602bc8e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 10:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55b2654d5fea71586eafa89e2b6d1e14 SHA-1: 84a3ce27a7c88ef7e43b3c2fc91e9656f6c32179 SHA-256: 285534ef9602bc8ec7e79194015b75bfe56d6deb2a940eab583a271169a03ecd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites and disposable hosting. This pattern is commonly used for SEO poisoning or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://datatech-int.com/userfiles/file/91675781519.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/248075e17676ad19c4083f9c0d7e8674/robuzutolivekem.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/tozidobofugikunebeludevaf.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/69283840958.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/mafegifoponika.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/38f9856694e814f48b9eb064a84eb32a/82771447266.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d32f243e7---60680739671.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/wuvonaxaforirimugotimaw.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800dc032515---minamo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113394192e80---tavadolaxojofi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b0f71cc9---xamobiziwubor.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/20457694327.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d365cdf0---tinojasis.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/62481376701.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t7sk1r9rr71e2hiheqb0847po3/76709036460.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/25026513932.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/86688253920.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/230906186822.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e032a700---91963764184.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210610020837.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b86f22149---92768118649.pdfIn PDF document text
    • http://saktigroup.in/uploads/31057671079.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/65926154819.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d05c4b478aa3ee2445904e6c10a42e07/sizilivifanan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=clinical+periodontology+and+implant+dentistry+5th+edition+pdfPDF 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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 11344 bytes
SHA-256: 526945b97bf67ccb8d1e76bdaa46ffa2d21daa502a0140d1452efade4459347e
font_01_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 18656 bytes
SHA-256: 1cbd6d295b0442bf1981b46fd40cf7b9e6595f151bf7e265b3ba39178e4615ae