Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ff40c583c27458…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 01:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e78457737912e880fd383c0352027ad SHA-1: f279c20dfd17c69ef206b38824e0de54bed626ea SHA-256: e2ff40c583c27458233facbb2d9d3c803a5c2d0a5e53d50e7db2cf627562c3cb
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious destinations. The presence of these links and the heuristic firing 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bahtiyardishekimi.com/fckfiles/file/26166333439.pdf In PDF document text
    • https://usgcambodia.com/userfiles/file/lufaxuvesedamene.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/73551582737.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109130836078090.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/da9928bafd1cadc0172db42c3c0df0db/88962211478.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/pudizefetukutotu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412030b02f4---7357588867.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/jenunalapemek.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/64841202676.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/velawuponusijeta.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613763575ede9---wegadu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nigasulov.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210909071509.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/16169418284.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/jotoxejemijaxopekumivinu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/16388504623.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/tomasatutifekuduzifuk.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/48369013073.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/77506041957.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ba15bb6f---2024788963.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/10395508971.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zowudosilogi.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/10983918920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+amazing+apps+for+androidPDF 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_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 10908 bytes
SHA-256: abb92c9fe0181c33feb0d22df50f72938104f22a182f98f69ce7ec44221cd022
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 17672 bytes
SHA-256: b2f3c95ed4a2ba264871354f6ecedc6de82b2b0bc2faeef4cffec09bbdad4ac7