Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373cc1a814416ab…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 20:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1aa661fff0ad2c63f2987338dc520e9 SHA-1: 3594bf2bc07390cd715b81ce2c7b9886e59a374f SHA-256: e373cc1a814416abcafa54952e916101a7bec1c9f75b2077fc564ef9f3de0fe3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/lekuxovibupuv.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a5470186a---zoxefemexowixudavop.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4c454800---35590235028.pdfIn PDF document text
    • http://splogservice.ru/content/file/lonedapifizunexasopop.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fb722cc3b8d41a0174c4bb4009ffcd92/minugabumelimagax.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/depametilivaremula.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/gimovexa.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/holne07br8m9mqqnolcahbtiq7/76532604634.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5t106oc1nllla85c6fmaofi32g/94997685606.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b71981a20---31535404498.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k1hdhn3alr6gp12t9r676vo1s6/pinanamosoxezevej.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/mezifexofinenululi.pdfIn PDF document text
    • https://jetaime-shop.com/files/nedala.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/64828877790.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/sovedo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bf8a8c187c0630c40cb1743de7ac30f/notodejizomukobejeweki.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/15480448236.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a3f3ea9a---wetowobulogim.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nolademovoliwipesitenur.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xifupopakikifunesiwimexez.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/35829683142.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084db6dc9720---rovororilo.pdfIn PDF document text
    • https://motacademy.it/file/32293897736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=squats+for+a+weekPDF 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_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 10464 bytes
SHA-256: 0ec5f5a88820090ad6bb3b6b4627d32f3703279d09def21f9971dc52ef3d351a
font_02_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 17160 bytes
SHA-256: 523f990f4ea70269a5c8d375960a150ef596e55a702011641e58db9ee72a7859