Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a3a2640721c58…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 13:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac78a3f62d96c150e428457022175856 SHA-1: c5762fbe5fcf25d9789940c19b26f38946095926 SHA-256: f75a3a2640721c58ffebdacf896c4397a89975f6cb73c6381fd8775b74751716
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://paulgraphics.paulsfashion.in/files/75842610517.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eb0e6eae47cc009f775b1978926e8070/begofojopek.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cba31b49---28784513958.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/mokomejo.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/7394809357.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ko86nqpb2iq2no6c75ifgtmkn6/dolifovuwasesutujet.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/68221469680.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/38862339060.pdfIn PDF document text
    • http://iltorg.ru/upload/file/43759186942.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/62138593448.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/725384022.pdfIn PDF document text
    • https://comfort8889.com/upload/files/joxekukeraratonoxojuti.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/kiwelelovujoporumi.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/pibakuremakigug.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/toratigixipujoxim.pdfIn PDF document text
    • http://mextro.de/upload/files/4172917092.pdfIn PDF document text
    • http://thevale.us/userimages/pebopanu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613174347834d---40215960906.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/zagowisegepupetolage.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xigagovatoferagizixe.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202192175742.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/jubuvelutusaforag.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/rexununotiwuxadunuwujeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=basic+apk+compilerPDF 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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10480 bytes
SHA-256: 8de52bea438a91ec9817c1007cbf413adabbddfc0be68358f9fa3572242c4ed4
font_01_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 18508 bytes
SHA-256: ad4d2c5e31ad1f749a6c5d8cae80596279cf646023ea9da5c2dc608f4025f0cd
font_02_sfnt_off00013d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1