Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dd069b6bd573f4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 19:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 542d084b22b8feb2b75cc22ec53b755e SHA-1: e7c94cf97a710594d622d703be9c5fc82fcb6cfb SHA-256: 91dd069b6bd573f43e152c59f6bec16f21a5073e8077c6c821d6911b4c65b231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malware. The presence of external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e946a340---41906180978.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99970386c---81032258012.pdfIn PDF document text
    • http://kasargod.net/uploads/file/moladupekovozanuj.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/lozomogoxemanukuzizux.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/borewenasubetagid.pdfIn PDF document text
    • https://wineart.online/userfiles/file/tadifoboxukuwufekudaviw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610627ac58aae---59766205037.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100c2041084d---zegexajali.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/892b09db5b0b6c63a0a2e06dc4d9c93a/xupes.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/77584006368.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/11010091381.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/88944563128.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/61901890125.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/kowetimipupaxipijufi.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/40025995706.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/85101441659.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/79113068674.pdfIn PDF document text
    • https://2winit.com/Files/files/31994648056.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-15/20210515040049366329.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/76698693285.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0b604da5---rikizuzetabomegatelawas.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d663f3d6---71469428236.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/77706645328.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160865581c590e---75770228174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=iem+standard+form+of+contract+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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 17116 bytes
SHA-256: 58e091dc12179b37a02ac591ad97ddc84303d832e8730239b03246a48db05d2c
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 10592 bytes
SHA-256: 6a542085e0191b391c52ea8e2477e995495cc751e0a0c1878b1d575ade3102f8