Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13212c8151eb480…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 08:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9c242078edcdc0f9ee65b932131b789 SHA-1: 8f9f033cd05749ade44f3b377051967621c11b7b SHA-256: f13212c8151eb480cf238b44c5ceac4047d47196cc2418e52e6bb53b60508ba3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on low-reputation hosting to potentially trick search engines or users. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading and running a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abwingsva.com/uploads/files/75212535695.pdf In PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/69372299381.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/58117908527.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/punopubelisotoz.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/7740580948.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t95tcfutc096s5nc8flnft5gej/giwadododavore.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/66117381095.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/15466410150.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/rakinejidenobut.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/tesetekijeb.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/lakomuwisapigax.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/43243412088.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976d96a8f6---61316474757.pdfIn PDF document text
    • http://ladna.pl/user_images/file/32516558143.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/3542816320.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/posilinuzoboxamo.pdfIn PDF document text
    • https://tsegypt.com/file/15625388245.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e937d7f7d---wuzoxesiwotefogoxuvagi.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/menorozuruxanudiruwu.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/88776047437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+vice+city+game+download+apk+obbPDF 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_off0000c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC230 18416 bytes
SHA-256: a2154dc63e559bd2022c15c524bb28a24daa41ca13a1bff894381ee90bc3381a
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 11128 bytes
SHA-256: 6ee5795761e469dbcf675d6b4f6462b68510629cc03baf898f0187e8c1404020