Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1251bfad39cec63…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 16:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8166ce6c4b214cfa0b444b9ee64cf54 SHA-1: c46ca1c175de25074b6dd8995b323111693dba9a SHA-256: a1251bfad39cec63a8dccd89b752e8d3e68f451b4776610b362da48048ca40a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as a distribution point for phishing or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5ee254f7596b2ff187803ffaf6ff0350/74488706058.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b309bcec91---56885273210.pdfIn PDF document text
    • http://lukinserv.hu/file/68012741106.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1qrc86c5lqc0sdve6tshns8e0r/49447715488.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2f1f83f36e3ba10f7197b4cee71244aa/durajezokibezamasujagidi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/97fa250e971f79402e6e2f3abeb806d3/gikexozerowoguzonon.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/97510047794.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zatagujetupudiliputugozig.pdfIn PDF document text
    • http://nessium.net/userfiles/file/66306485172.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/20285644826.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/pumatemipizuxo.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3654bb1b4e---5822220665.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/zojusorekanefij.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50b2e74b3---25816144594.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/87128178632.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/64711900450.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1acd0ef57---58239038640.pdfIn PDF document text
    • http://cke.hk/userfiles/37703867863.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/33175377863.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/5264185509.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091242210a40---38295626267.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/sawobenetamutileripa.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5b89c1dfce157e0789873f031e79fbc6/2062540555.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3de20f84f565818f6c8ac60827b14837/wasotuw.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/8896719181.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/16487313000.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b9d05791ad869063fbc567e25214926/wefubunujabaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=occupational+safety+and+health+standards+philippines+2018+pdfPDF 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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 11456 bytes
SHA-256: 766328ed4fa16805bdf82a37ba01c070fbb5ffb85a798b94d3c3d844a7bf3c3b
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16616 bytes
SHA-256: e56afeac7a1cfa9551dd13e401d4e7e85cdd07f53d42e267e79bd3f71d414e24
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1