Malicious PDF — malware analysis report

Static analysis result for SHA-256 1287d49242aed9b6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 15:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c235701e6aa00dcef22fc13e8570352 SHA-1: 56d417f217f706f14586a5e362a9705c9aecd90b SHA-256: 1287d49242aed9b698c96b68b0dbb50976240a219dae3f30b6f2f889c9d3831a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware download pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=types+of+accounting+information+systems+pdf PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f764716a3f---91689783432.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5611cc7b94d1a19c39b8f23cee3ca53e/narumodusiraxumesede.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/vekixoto.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/54771306360.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/30481998194.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/69892999918.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e393e6919---dafelobubawevavatoge.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/64154743318.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/20520004292.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/25653376137.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/33628445260.pdfIn PDF document text
    • https://irrisyst.eu/files/file/86721682509.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/zexuwuvunosivowarofut.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395ac9ee521---dowoxokafilarisituji.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/fuxanebidopeforesa.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/nerurimeranosixamamazepix.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dufipigu.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/54035666990.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57817442916.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/7213448228.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/ranuwopetemobotu.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/96089360699.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/90687334610.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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 11092 bytes
SHA-256: 3240a34f4de24191c8c087197d09ea50ee4498d5254f88ad5d74ec312c42c781
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 17224 bytes
SHA-256: 4378150d156d014abfce148eb1b5ac3c9f5f6a42f2d36de78f14d57d3228879e
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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