Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efe71a161fcfa00…

MALICIOUS

PDF

81.6 KB Created: 2021-07-24 05:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13b21143a032784395b04ba3286c2ccc SHA-1: b989982ae8dc19f4ff812c800e75e12ace711384 SHA-256: 6efe71a161fcfa00c7cc85ea61833347705fb2f7ed2e78a46fad48d55ed4cf5b
156 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771dcba3996---biverobe.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/692221cf90e7aa9636348e1e3200ff06/rofanekumuz.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bcea13db5fc300a2234bc4bf08b1adf/23351793207.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a3ac5c81---bixasekixonajopexo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/h8o84nh2ptj09dcm4i7pfvqc7q/8694119957.pdfIn PDF document text
    • http://accronline.com/userfiles/file/soduxadibibepapibopodij.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/21676167821.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/nasumegavomiwalenutur.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb72590dab---wijizejipowiwukemux.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/nukatofebopusipuj.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/09ab406a95622ec2f6583fda2b62638b/bejipazunumikepinusar.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/rimuzopixetepabutete.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a2f0f08c---27211586146.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nr499d01i9ja7qh4gvngqfmf75/90606966485.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/20f2469442c891984e84a68fcdff19ba/39376743491.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb195893a---pavetanukijipuworeji.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/furapawerisomovokebape.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7ea926b2---tavonetumitowimepuje.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/35488484979.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/038923bc98c2c285560317f5a031c33a/36480653349.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/29724576775.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/44011025144.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/riwisawikoves.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d195e96d9790983c4e63435fdba38a75/59728232557.pdfIn PDF document text
    • https://digireg.se/upload/depeseraxefudisazuvufivol.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210628071716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kinds+of+sentences+exercise+for+class+4PDF 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_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 10640 bytes
SHA-256: 5f070db851fe92d7f032f8264e8bfc9c40af72ad40d02e155e28dbe0ad0e3306
font_02_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 16800 bytes
SHA-256: 5a8cfca02f327f0bcbaa2c62c2da54e486aec8e725723e2bad7cdbcd40326520