Malicious PDF — malware analysis report

Static analysis result for SHA-256 76519828cdd354b5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 17:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b36a79288480f8b13e80bb627ed75e4c SHA-1: 81725ec9fb5ef2fda0ee4bd98ef94b566348240a SHA-256: 76519828cdd354b594208048c33079d62a85311505f7846abd93cc46fa0263f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/325781ee61bc3b233efa585ba1e07106/wufofelol.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/86711276380.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/82263299103.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/152109479265.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608300851085d---17560775409.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/47484965279.pdfIn PDF document text
    • http://dsagco.com/Upload/file/podidogojafa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1a346b10---lizolu.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/77183529967.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/80910381433.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/dadigejuvadegisobudil.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/rekeba.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608164499c75f---jagabapivobanenelevabi.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/ginimege.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ccaae0beb98a689943747f58dcc1874d/lesaz.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/68530208524.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/bewof.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/96250869128.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/mamixu.pdfIn PDF document text
    • http://humanlitech.com/files/files/pozasojetuzobibukonok.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/82bfcd700c32f1b6b905b5f0c92c47d0/numiromevazedinowinuv.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/debatekure.pdfIn PDF document text
    • http://goref.ru/files/file/71057280929.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/88751946125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=1995+jeep+cherokee+manual+transmission+for+salePDF 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11324 bytes
SHA-256: 06121836c88e67da7b3ad51769b198b65c5c2848e02184ec8ea074ca0ac8c29c
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 17960 bytes
SHA-256: c19adb8f78e23163e1a419b92b96c528edb337a7f8cbc3bd7dede16062d30c44
font_02_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1