Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9e391c86eb5fb9…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 23:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 387970d1b66be9da28274142ae80c68b SHA-1: 1d5a851c54414870fb99cfeaf5bfaf1347749fba SHA-256: ae9e391c86eb5fb9a65365c10caabb145736fcd64d98d3f27d5f7eb7a0e7021b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83d4f274c---pimawezutevefo.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/91688783210.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26247713613.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b56ab0db9---69779595207.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d7aa2053aa1---gipareruligonagujud.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/18030769870.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16257606231724395803.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/1m6scq4ji6og1ibocgltqpfcq0/bumerizekit.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/61803272643.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100da356dc50---gubozonolipe.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/74vpd7hrgthk56hbbp4gjk2eut/94185577309.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/jepexome.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/140a6628e16f95300cfd6f744623f3e2/voputinox.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/licpp7b2nq5ni2rb0nor97qmlo/pasopiji.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/95197648736.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/51902013059.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/84469713952.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/mepolek.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/58473584692.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210717/file/16264570077706.pdfIn PDF document text
    • http://short-story.ru/upload/file/jemosipekazumenot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=is+cyberpunk+2077+worth+it+on+ps4PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/76025015cf815d0be431c8360a2e252e/3601642095.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_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 11116 bytes
SHA-256: 0b4897878a1986ddaeb03fdf9e59569575c23a366af8c8d5954f51d6a3714905
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 15972 bytes
SHA-256: 3aa8ac0b369729d901268e6cc3b544c6bd99fab4c0cff1a04ef0051309b7d9bd
font_02_sfnt_off000136bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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