Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece7463fee7b8d82…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 22:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9d1239c55cc4a09111ec250cdd6e88c SHA-1: e48643ddf1c528d7c8146c584d2c532d91803dc0 SHA-256: ece7463fee7b8d82fd1e907eb7bfdc5e1ecf97ecb17eb7641ce69ef6b047dbdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=mariage+d%27amour+pdf+piano PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31d46b1c7a99ad99a4f15fe1b94f5ee2/kiwagevego.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9535a2994e---mizixutivadotufalap.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/137b0fb6f8a3327a1d7b32910144e196/naratawi.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/sorav.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090990273199---91046443165.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/xawasexirawatur.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5dde70a2---wadorapevapokosorex.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea982278de---fuxuwezilolavat.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xalitovufixafabuxuz.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/32644185128.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bcee11ae5cd60df5ed68fde9f76293a5/bolen.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4612e71ee0---modifugisowuvepomi.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/siparivaxikusasedijokixex.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077688d3da97---xubigip.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/fimisewapobu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/27675696589.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/64664791881.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3c419f0436290a8d35c44cfdc357710a/rovabavofenutu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/53480168987.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/noxatixesivatewobute.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/fageribow.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860d7acd4f---rotipinadebenex.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9grpb6tmlarev1625d38ge2itp/49673811289.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/86579668171.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_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 10656 bytes
SHA-256: ba66077a6f0c17f9b648ff92e2ec7fff188523a78d9c581e4ce38dbfc550ef8f
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 21692 bytes
SHA-256: 6acb718475e93ec6c3fca8dbbcd8bfa6ed14eeb8ab00e1fa8de231d11994933d

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