Malicious PDF — malware analysis report

Static analysis result for SHA-256 3035cf2c38e281e4…

MALICIOUS

PDF

96.8 KB Created: 2021-08-17 16:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afc78e012e9e7f6183e5e0d23c847d40 SHA-1: 429440e4b6b0fdc59c53a4b278c1d1fed333c4b7 SHA-256: 3035cf2c38e281e44d2a3b6c029b0e4fa9199977e2b8fd21ac045a949953f5ae
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://avtrak.ru/ckfinder/userfiles/files/zekapojusar.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df542c77493---gatumifojixasob.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0f0938c66262e2917996a267ae4078fb/6961319887.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eaaaec3ab---poviripada.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/90948750195.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/46666188515.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/tufimipawep.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16786326170.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/73054b263a30723b6410fd075e711134/47386334719.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24978839278.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160863ba812800---midewejorus.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ff19a86f---10155831812.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/afe406820de04ff0da71641c1cf1676f/mifarixawuzuxuk.pdfIn PDF document text
    • https://euchebnici.com/img/file/95316012281.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/86ea60bcaed04e462d48771d5670766c/digugikamekidopeguwoxiwe.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/fafawutefogafakijawubiwa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507075413196.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8ff3750730f1c5841ee6f19e65b1fa3f/pubemonoj.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/gevik.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/rivozitetuxalab.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3e66bd15---nulinuvenu.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/nnean8oett1ccnv4kl0tu19b04/tilixikeb.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/fudubafaxujivigitabemize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=revue+technique+renault+clio+3+filetype+pdf+t%C3%A9l%C3%A9chargerPDF 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_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 19492 bytes
SHA-256: d7d38da9e68939564bd3ecc9f2922a09502ddad234f17474956e55a9eb5022bd
font_02_sfnt_off000157cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CB 11528 bytes
SHA-256: 27d7ddd04112dfd809ffbd17a01d3f8a0bf23262607474230d04bcaccc687f79

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