Malicious PDF — malware analysis report

Static analysis result for SHA-256 89836c5818d15f2a…

MALICIOUS

PDF

98.6 KB Created: 2021-07-17 03:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d3145f6b9e555167daaa15155ed3cf7d SHA-1: fc5930dd0bf908fe67e11f3985df0aa1d6b0f961 SHA-256: 89836c5818d15f2a6a78c0eed3cbe78aa8250cc734b1597324713374d12b9f75
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, specifically targeting upload directories. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs suggests a phishing or scam campaign aimed at distributing further malware or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 5

  • 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2c6dd5d202ed247132318b98820299a9/43233025645.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5eb38b9aa16ecb3941d7e643dc0a4f8/doleluwonawilonisifaxa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e3cc8eac---kidivowifotedonor.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/mivodazutarat.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/10583685094.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/lolekasuwupaxufadanamumif.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80bde6868d---42975276856.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/bedexobekubilidatibabikur.pdfIn PDF document text
    • http://capital96.com/userfiles/file/sixuvalarekomemixelikufil.pdfIn PDF document text
    • http://www.asslar.de/downloads/73750265020.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fd388a9c5---49250215981.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/bokarasipo.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/gukofadenov.pdfIn PDF document text
    • http://derma-dts.de/files/file/remen.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2daa5a1fad---zukugabovafefigigedetobir.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6476012aab0f8a7698046c2d9e2415f6/pupolanotofalel.pdfIn PDF document text
    • https://suksesunited.com/contents//files/11123234882.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/60848985925.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/57500561015.pdfIn PDF document text
    • http://www.celso.org/download/76186271989.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b314854dc5---sorozil.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/18743881063.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d867a0bcc---98454374318.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210703131435_zl232n.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/25664182045.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3684957f1a---45843026259.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/61941897395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=reasoning+calendar+question+in+english+pdf+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691
font_02_sfnt_off00012f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 11276 bytes
SHA-256: 72862f49ad4464f8a44436e4b5b34aec940c473f2c1b2c89b0610e3a86d8069b
font_03_sfnt_off00014983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14983 18408 bytes
SHA-256: 977176128c73b5e925b8f90f50067f9cab2890ed50e59767f509279893db75ec

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