Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58bdcfbb76eb094…

MALICIOUS

PDF

138.1 KB Created: 2021-09-04 01:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed2ffda2b10b13012e7c96b587a3a2e5 SHA-1: 974d2edeee8c578a49eff27b4b850b3d4721b999 SHA-256: e58bdcfbb76eb094b61b81a37c9778a9356fc2650164d06dd42f34e7ae2d1dce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's purpose is to direct users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2369cb6f---46158252992.pdf In PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/76404773342.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/09gn270kp6dfkgcqv1em7dflb3/27299958997.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/sevij.pdfIn PDF document text
    • http://kme-kme.cz/files/file/sevewozujada.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/penufojadojatabidefije.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wugaromajavipite.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pinofoxipefonudadoba.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da83a72640---jozisomovinevazaworosumow.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2ea12d00---52039407082.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/2133967478.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/38776448574.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/bowuduxejigugarebuni.pdfIn PDF document text
    • http://flirdining.com/uploads/files/60113400488.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/9096254116.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/fibejisafabejaxifa.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075778ec3715---favafipobekujudivijet.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/kesose.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5ur36ck4kiq8pcujh8nr0ulae7/pafafikisexoxoro.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/13818240395.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ce4ccd12---43133875669.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/48016091787.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fee255a3d4b---kubujuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+womanly+art+of+breastfeeding+8th+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_off0001b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD70 11456 bytes
SHA-256: d34026e6c15288eefc5a9cf69761aad8b1fd496a02b98fdad40b5bee3c9d33a2
font_02_sfnt_off0001e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7F5 19080 bytes
SHA-256: c72ab6d6709047341d66516c54935b41b353a996f6aa795ee18da9caf7153897

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