Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a03025ef687b7c5…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 16:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b49f4a0bd6f5216b0caba807960d742c SHA-1: 8a4484aa01f1d70c79da6830d6bf683cb4b0020c SHA-256: 1a03025ef687b7c5a0a81a03fc51580eccc8013e7d922f95163438010a91311e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00b44a794---84972778596.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8c825f910b39ee605b41a36733e94b49/5910017044.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0ef1bd18---lurovofaputifozure.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/67233433024.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/xedabofekulogemotiw.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128f7ad0645f---zizifitolera.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kesamowasuf.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/42825062590.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wowipipumedapogobuveva.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/miwedomidigufegitutinos.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/sorexi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5raknht909e2eg2hkmln02pt34/9342643546.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/33219664317.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/76888885733.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/45901021436.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6k45rlsdfjn1fucgcf5i6j8j8p/jimegusexixifejimajokejab.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/32932278173.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/luluserobukifel.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/52845019216.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/77787317436.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f870cdb613---14041750219.pdfIn PDF document text
    • https://badrivishal.com/media/71835832565.pdfIn PDF document text
    • http://novichiha.ru/pic/file/84769502917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transcription+translation+practice+worksheet+answer+keyPDF 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_off0000b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 16092 bytes
SHA-256: a65f9b76c76afe1f11f9cceee7e43c6290f93b0fba802cd5102401885acc31e7
font_01_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 10728 bytes
SHA-256: c94cd3eaff69e7261a30501350b907b46d5c68f277e79378bb3b1cde84df8c9d