Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aec098d68dcfc6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 07:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d58b8dda9f37b2f9299c247601ae279 SHA-1: 923071eb348bfe814ceb03dfdfbbe92f39e395dd SHA-256: 31aec098d68dcfc647008c835bcd7e497adb0e36c230d699f1825b9d54a7d7ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. This indicates the document is likely a link farm designed to redirect users to malicious sites, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=words+starting+with+gl+for+grade+1 PDF link annotation
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/698f1dc2e08850e803d1ed5bb4832a17/42966941057.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/77686653737.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/81723082490.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/52213323366.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f463210e73---97016348103.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16219007312427.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff57f5ac1c---fotitixogetebuwozetevu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/tawesufapuvipejiror.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/iu4ukrj2pt3rvu80sia1bmu1je/45934353093.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/4649815541.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/pojibanaripapigenus.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rf9nmlcuotm2doovmv0m9veqbe/xoruzopoxugisux.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/38487040013.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/vowupamalijoraremuvobi.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/20927888081.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0780b121d---bakijilipukemunabomap.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ac241789cb4c62b8dcf36377b05e6fdc/57701531700.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/76538856041.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/082726n3498sfl4bjj77vd52s5/rarimukimagezoloso.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/4557483720.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826745f38a7---vegow.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/cq7dvtask94f7ip9huiqeq5ag6/92576775701.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/notokezaguzaradir.pdfIn PDF document text
    • https://irrisyst.eu/files/file/77828154543.pdfIn PDF document text
    • 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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17404 bytes
SHA-256: d7c66e44d04c72d31479f9dc549efebef98e6ca92d4f6b1c8588bd883936021e
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10764 bytes
SHA-256: 3ceb614c30979ff6f8a76300b5d62c51c8204a8bd68ad4a941bff5b38c9b389a
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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