Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be75c022e20638f…

MALICIOUS

PDF

95.2 KB Created: 2021-07-25 12:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8277384dcbc3266cc7f49f5c56dfe43d SHA-1: 0e6f21906153a316254434e01945785c2090d0d0 SHA-256: 8be75c022e20638f41eacb33199f21c8d5714845bdd86d988f6006c1e0db4dd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, a common tactic for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.antoniopopolizio.it/ckfinder/userfiles/files/34280692863.pdf In PDF document text
    • http://pneusmarene.it/images/file/dulidos.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/33255883934.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/mitulewedolaw.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zifegevefefezexelamepi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/84f096b3e6c2733d3ec14a509bba752a/kogase.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/26a0e40b38b8644e5b22c58cca278f17/9255774967.pdfIn PDF document text
    • http://www.520amis.com/upload/files/7032495080.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kajuno.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/58115881137.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/kubaz.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/konepejotite.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/rovewosamuvekalomitajifa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89c471778---70220077332.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6aa427ccdd6bfaff2be98df133ffb256/97212803853.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22817e753ae6f04f3c5c03453c325915/zavifetep.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/7a0df8a32ec5107836cf98bfa346d7d9/witumakajilasafepavosez.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a558be1f7---zanijuwobisadofuxunexan.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f2d4f46f---76422364625.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8e727f912---rafogogipo.pdfIn PDF document text
    • http://guowangcable.com/d/files/gixoz.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878385dadaf---15735533002.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8a3a39fb2c456f1e673d764f90f0dd58/welobobekidaf.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/loxegitozapenevobanesoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=polinomios+suma+resta+multiplicacion+y+division+ejercicios+resueltosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 11088 bytes
SHA-256: 297cab3e2a25b7c5db45838279529afda554b01139e413c32fe8a1af03ab2c63
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 18800 bytes
SHA-256: 8c8e97761ca7b77d137c88b213b7e61fcd223d2f5722b15973115156865fc615
font_03_sfnt_off0001528f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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