Malicious PDF — malware analysis report

Static analysis result for SHA-256 b416de5004f2a94f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 07:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d6b04099a8c63078eb11e8131578aba0 SHA-1: 17931b5f64c97fa7d411e2399213d1a15a3d2508 SHA-256: b416de5004f2a94f3ca4f93b290f59692c826461993de43f184a7b6ab3f3d207
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's used to distribute further malware or conduct phishing attacks. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

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://ketchas.ru/uplcv?utm_term=kinds+of+conflict+in+a+short+story PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbc5aa748---javepenuligurezukaj.pdfIn PDF document text
    • http://come2menorca.com/images/file/xivum.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pojemifurepazerobexira.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094902dd5bbc---xesaredotapexufezanotutum.pdfIn PDF document text
    • https://nicosiacaffe.it/file/98465463672.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/fe9f71cbeeb90da3e1dc0f8fb4b171a3/vovulujipotoxamo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086768b8ff36---7837694820.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/ravagipefen.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/33869634801.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/48791005893.pdfIn PDF document text
    • http://idcla.net/upload/files/tigisetokenufavadarenabim.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0197acb43796859690d70273d2ec7f49/pigofuzadanunavepu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/meacs0g9uvun1hc9h7q9f2nam3/59149345144.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/5366690976.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/tinorovipidexo.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/denameje.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/34074358409.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18785e46---nomota.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed40c1e190---kuzotiwokasusakuv.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad294e54f6fd82da171abafddec6f442/65466428979.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/kijufuxowuburebax.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/xumesufi.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/wazemalikasufedurotoj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6d7215e10dfce0cf3f19513dd2a70082/49976115204.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_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 17600 bytes
SHA-256: ea4ffb65863e606992e074fafce2eecb030074e8c6828ac612c81e67adc9be63
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 10548 bytes
SHA-256: da50844ec024c887d6a591125ef9500d9a419c8e3d12ca84477e64dc619577c4
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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