Malicious PDF — malware analysis report

Static analysis result for SHA-256 14efbefb15d66bb2…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 06:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fac24a630286f775e5f332e865e3231d SHA-1: 5b9d6fa30f1114c763a10d5b25539252afd4ee08 SHA-256: 14efbefb15d66bb2026315c301ccf1633d9255aa36586f0658aa1c8d3bd449b3
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights this malicious infrastructure.

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 https://hosvagyok.hu/userfiles/file/51033451055.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/34168524292.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/zomixivoxe.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/21903521699.pdfIn PDF document text
    • http://ktcz.eu/files/files/vopolifavomor.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/38025407573.pdfIn PDF document text
    • https://yorapp.it/file/sujivimomoburerofewuk.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1646e307---davedelowo.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210626071458_kdjp9o.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16091141003d31---10139209799.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/60351306963.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/21150f774e7b4ef711583c80522f9882/1663211984.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/dqm08rid5kshbiu8e3mt2vgo5h/gewude.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vugefakafinalazeku.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/klvommiqie2a73l7jte6gr7nup/kukumuz.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/vunadujatonimaselujetew.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/javonoxumumiremijil.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1890708328608f50e8d4690.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921eab5de30---tarumenopodu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kasaxanubukibu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55b551d2e---kijemixatamug.pdfIn PDF document text
    • http://rld-carbon.ru/file/14096214500.pdfIn PDF document text
    • http://riceart.ir/basefile/files/fesibaverujajexotowus.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd38ae0e0---kavipuduzawajudonolisamos.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac61a4ed5---9474950444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=carrie+white+2013PDF 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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 10352 bytes
SHA-256: 6cd42d6c61f2d394bbf0263b25c30cefdda4b03c784a67fc179d29320b7b7a91
font_02_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 20784 bytes
SHA-256: 745ca97aef0c72ef995ffba1d7367a23f71256931729afc8642955ff232482e0

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