Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54b041bc4dcf483…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 03:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7e0de13178885529495098cfe44a45c SHA-1: e00cef4abcc9790ac9bf48925fc886ab2d654b7b SHA-256: b54b041bc4dcf483e30573ee0159a4dcd50ae6ea05c8eb0bf81f24d16c8601e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baafe9e0b2a---gejenorulefupas.pdf In PDF document text
    • https://mgc.to/sites/web/upload/files/nizolusitizitelaso.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c585ef25e---kujevuwalugumibusajimo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16121a1207b8d5---mutiwofomipixidezotez.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/vavipudobo.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/7646875173.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f6f9eaed41c468d2ca95085fe642e114/42446848599.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/510cbcdf3a5cfd42f7f74e061c272a4d/gabosotavobunixi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/71343202351.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bc227bf0---vevovodevera.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e89fc1eb4836ad689ecbbe90bdb9f79b/17601268920.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zogoxu.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/85662437642.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160789f366d04d---64960147348.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/bovefijapudifefuwekosonim.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/jafetipulunojebejogeze.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/90070340006.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/65701b767bad2ffd1221d6da749b89ae/nibizaxowujuzaxusose.pdfIn PDF document text
    • http://nkland.org/userfiles/files/zekizaxed.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/62218381036.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e321075710---selelunajevogusu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/15b6385a1eacc15d7e9592f3cdeca791/fepip.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/46b31c47a7f874e9a734613f12b9bfd4/vibisoxinenisozisujika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=covenant+seminary+counselingPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 18496 bytes
SHA-256: 2b0b638c67a60f3c2ed5ae1db89b0c4f3568ddf138475cdfb2f921746618726a
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 10884 bytes
SHA-256: 01b5f27cc8b3cfad62418f2bb726544a5c160986829c8fcc2e5e98884401ec59

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