Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d49513bc270e70…

MALICIOUS

PDF

81.8 KB Created: 2021-07-07 16:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88687bf1e95ce26150a07a2b87dd41b3 SHA-1: fca32f70af9fb9a5af4aa8bee5f109340e4eaeaf SHA-256: c5d49513bc270e702063a87cee32040d58cc666f4653137cb30ee1ba19968378
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the document's structure and embedded URLs are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=queen+of+peace+convent PDF link annotation
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/sdq5n9aql0jlcnjt394osikcps/bekupenorugexura.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/afhdc0i4t14lk723iqft1ophgt/tufefalalusevanakogas.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/91431371385.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5e2b99ed---53077095025.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ts2ekjjmmntva2hia343tscc97/62363740182.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tubuxejilaparujukuxe.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/31833188443.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608615c689299---tefolinikis.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/47lt5610seaerk9nm6f4fa10vs/nofakuzowod.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/lawupa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc43199a8---latakinerateleros.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/12292151225.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/pizofobapazirimafube.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/164prc1eb4i58bldqtshdspd2f/84706922777.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0dc8232f5---pebuxurajuromobojib.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086395b032ee---28094983839.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae1f36d3ac---54283103689.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kefora.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/xopobijenadowovuzug.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/25246212987.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/be5bb936ce7b1b4fb6e4f7c4793ee4b5/44964488137.pdfIn PDF document text
    • http://unsersohn.ch/images/file/rosalexaxenuzor.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/79822488880.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce3465cf5---24898824949.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c043614d---baniragakaralamu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b0aa9262---54775273759.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb92732e01---37879489170.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10292 bytes
SHA-256: 85b47e11d624de1e2f0e325cd8a938af42947791ced75339a49c2543b8508af2
font_02_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 17772 bytes
SHA-256: a93d75bed92b78808c2a5e1521838b4d8a508f3d234335fd80f8e66bcaf86987