Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a063c2345238f23…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 06:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9ad70adbc9f70c4b2f20d8214a92b7c SHA-1: 6e4ff539cd3e0bd7f9ce928a84ac71e1d366040a SHA-256: 8a063c2345238f231de7de2c76d5e7c7463a76bc1076dac2943a5ac8a27a9e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aeronautike.com/userfiles/file/buxokupajijeladurira.pdf In PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/92167293040.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada5f7ed242---43798061188.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d52a14fca70d7703f888803d503f103e/zodixadi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606d903b52340---69658186336.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/zidajunaxux.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/bukifalozavanedos.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813decb14ca---kowoxijax.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/zofabelasapurizevidan.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/gogakubeweforurimezono.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/isbpdcqjo9kvsdgact4as3n5gg/68950069662.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/068je37mda8b85hq5vqmpqf1nk/7764408018.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/12771446679.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/segeruzudatesuzuxe.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c63e3b4f2b3fe1e01cb308ae1e4c3824/3112885350.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce69817974---48983750555.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955644fefd---12564034518.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/fibasodamiret.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/togoxizebojolumamunidenug.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/tixizunudomakegat.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bood5qgq32ipduarcesrf5a4v0/tovumulazuwaf.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/50737577615.pdfIn PDF document text
    • http://planetamama.ru/files/file/1631207499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=magical+knack+trait+pathfinderPDF 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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 18576 bytes
SHA-256: f30192c53718757e170abdf47e5e8ac07feeb3f11dc834a5922d80c28f74a547
font_01_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 10696 bytes
SHA-256: 2945f98dd95a6f0bc15ab81ecbc3360462cd83eac0830fb70e4121cb1421fc08
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1