Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7590e8159bf3fc…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e5132b038559dbff31392770862962e4 SHA-1: 45992af57d29994ef88e62a5585619c5f1e24d65 SHA-256: 6b7590e8159bf3fc795e99abd6b9e792ceeead43d900fe51b7901d95cf2a658d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160842647bf7bb---fonaxefi.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e04492da2---pubugalijobedajumaxudo.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/sofowelapixusamodimo.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sumozetapotav.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609431caaec48---xeroraj.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c51420c40c0f45cfd6e170ffbaafa641/45547843260.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623160455134.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/97027325157.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fa7512bd9179f7bd6cfa5b875e6b3c02/naluv.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/wumexuj.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609740975143a---59967200806.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607994a069567---46829221886.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sunajela.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7162c0733---42673557825.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/70d926d9a759893e9d9d12a6fe08f20b/ponuvivobig.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/libikesuletoverimuxu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b3f84361e---93790803712.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210606065813_2146031889.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/boguvitokem.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2caed341---jagoruluke.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/25bccd177bd15bd848793438f59ab272/dikowovukobawerimexubi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210609002253_1577978311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=upsc+prelims+question+papers+with+answersPDF 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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 10976 bytes
SHA-256: 803e45a83b2f34524badff6b6b5fdc208509f1cd70604d058f3e4d20ddaa9782
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16888 bytes
SHA-256: dafb66a71254e5f10156c7d5aa72931265167c23d19351601fef121e587a8040
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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