Malicious PDF — malware analysis report

Static analysis result for SHA-256 9414091052a321fa…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 19:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d6a21590a65edbbfa3c3e6ccce8a946 SHA-1: 43e29d0e535e3fdd6ec907e57236654601dd3b8a SHA-256: 9414091052a321fa07dbe100c2615ed5000e16a9a62f30d8a64f3c23f5f25fbb
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm the malicious nature of the PDF, identifying it as a phishing or trojan distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=pixel+4a+transfer+photos+to+pc PDF link annotation
    • https://clubforeducation.com/FCKeditor/userfiles/file/fojefavonifidewudu.pdfIn PDF document text
    • http://kant21.com/userData/board/file/70307016635.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/bexizonurel.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dqj76g0sl8npe1010206nvsusi/2698364840.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/72869906351.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/67743824249.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/59963256951.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/98646520583.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/voxoxubew.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/60257001708.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sozirubumojesuvediwob.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/59024101234.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/61675108600.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5319d1237---58051415376.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/78185781284.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090622575428212.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498ff83864---tedepusudafenewebes.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/88953646143.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gitanoded.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45841980051.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mexoxexufomurosazox.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/52637552936.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_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 10760 bytes
SHA-256: dac6087a2c065e3ea36cc8065f6e50477ab0e3432f077f707a36cfe73cc6d272
font_01_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 17672 bytes
SHA-256: c92d07ec889b6d5ef7f60c67789280ec6e0ca5775cd018cef549c1441f74522d