Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c59d176f623bf83…

MALICIOUS

PDF

74.1 KB Created: 2021-07-14 05:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5730e7432c99c242f071d8c8e02acb5 SHA-1: 7cb5235b1afc96a8570c5382020bdd28b47dff39 SHA-256: 6c59d176f623bf837c1415a46fe01e14d194363818d84b719d05054f940f0868
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other domains that host PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially inflate search engine rankings or direct traffic to various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5bfd0ff69dfe2eb110d8ae3f9d8f6d0e/seluduwenuzigurize.pdf In PDF document text
    • http://longthinhphat.net/uploads/files/10398914576.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/55459727899.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210620145535_gn8de9.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/60140268272.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/44222271435.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vdlt7fk22sg5dpvgkp58uo6fqt/7034624580.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/o49ug1d5o0t124p3gbooc7h2sq/67334826342.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/62470991474.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bidulugebi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1020c3e3e7---xanusazotawezata.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079003dd8378---73246899841.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/14793694182.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/mexuwatofow.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba0508e39---57741701621.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afc51292092---dusujugomobataginan.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075215883e25---xerufino.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42d297ea7---vewurapokulefete.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/75654783510.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb01e626d---fajozuxasanoz.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/87707692555.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3nvjkvljibqr4128qf48voa4c7/4897998099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=access+2007+for+dummies+pdf+freePDF 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_off0000c36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36A 10744 bytes
SHA-256: d209c18bbce31815a5c31d00ee7b745cc2015911f7aff6b9aee16e2eba555348
font_01_sfnt_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 15240 bytes
SHA-256: 0266e205f594df62a22334b67a49f2a3379313ce27599cae91017e74a41ee4b3
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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