Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8762d952d05517…

MALICIOUS

PDF

83.0 KB Created: 2021-08-31 19:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad1c90efb548e5d64588e2984687c64a SHA-1: 9ab27372bdcd7f7c35c1fbfa426fe4d5deaecb97 SHA-256: ab8762d952d05517269d52f43bad188c07671916f3ee41f61ffe5b1959f9d373
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm potentially used for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=used+items+for+sale PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d891541e8---basagumezexudifagunasepa.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jetatavo.pdfIn PDF document text
    • http://besteva.com/upload/files/topesazutomudeje.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073710d49b8c---14881374988.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/75841822435.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090a90f0c402---12914284113.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/gojudi.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/pomawumagozuxe.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/nosipapi.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/37727277165.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/99865349935.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfeb71fef.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c96e5752---25046554804.pdfIn PDF document text
    • https://mytopics.it/uploads/file/2774064642.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceba498f54d---63201498086.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa3dtvpkulusuloe4om3c29oae/31425763234.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/424216186.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/kixedoximarivika.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/migulexi.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/79015011508.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6a338d8c---posugulolujiwif.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce7734325---24896682597.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/boguxagitelomewaran.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/wiwaviteluwi.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 17692 bytes
SHA-256: bc0dc0a9ec2639668ae3d89cbb79aeb0d571b5b571e1292852d0b1e6b957d4ea
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 10420 bytes
SHA-256: f143b5134f70761515efc05415dbdd7b52578118191995df4db816d7934ae748

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