Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75b09d31e0bca30…

MALICIOUS

PDF

90.2 KB Created: 2021-08-19 08:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d3440e2b9af3cf71c0855f0dd133bfa SHA-1: d237880f277ecb32b0d0d0b201da40ebcb162a89 SHA-256: e75b09d31e0bca309e5e8893fdea5828917e35c3bf8a0613aebb12ca53a3131b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to potentially compromised CMS upload directories. While no scripts were extracted, the presence of numerous embedded URLs and the nature of the heuristics suggest a phishing or SEO manipulation attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6df31a68---donizurap.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///88322429957.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac4dbaad9---12438101143.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/28026847362.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7b2d1291a388c51cf2869177a5cab5b7/joxesoboduwafiroside.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fmj903prder4au5oj7oblgkdiv/valapevokokejow.pdfIn PDF document text
    • http://sparkpro.lv/content/file/jixuxolewar.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/28379381898.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217171438121934.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/94383007381.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dff3df307e5---benigaxur.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6f81c44f040983564ea0b8404568a6bf/sevemevupofanoripo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b279cf3cf9e---dinosir.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ba30ef73---75329460627.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/ninofanopafeloxuxol.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/gijikibafizerowawivusaz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/19j0pvk1dcpe3nqj099d2sii68/gokigegekiwoj.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/bizemububobawakalido.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160782e4297228---firedoxafin.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/jetinenojedaz.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/munidotomixurelimifu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/20612095166.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vvpq26ue7qm4ml2rd9nr2nh08u/kikugotig.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3abf1be7---tadopixa.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210816203417_y16xei.pdfIn PDF document text
    • https://proxus.nl/file/bamiwoxunuwifaxekejaluram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=como+terminar+una+relacion+que+no+tiene+futuroPDF 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_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 17956 bytes
SHA-256: 7e29aaf234ae725d3b507f3e3490d7a9ab044aa1a4da9013d2c9a88cccaa1340
font_02_sfnt_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 10608 bytes
SHA-256: 1ee90cd1dc6093de2f5f90785345cce1ef9228bd0b6a21a6d92cc1fc720b1161