Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e03ff924d6089b7…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 00:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7283d38e4a55b620f983410749d899c8 SHA-1: baa240ac6f4e451ab323c5e2309eafe706faeb53 SHA-256: 4e03ff924d6089b7a7f8b2901ccd37c5cc4888089dc026d5198fbbedceaf2967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The presence of a 'download button' heuristic further supports this phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c981752fe---kafixepafad.pdf In PDF document text
    • http://fmi.lu/userfiles/files/87731945176.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/saleziwopurugujis.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de622bcc4f---vadaremesukenemomej.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/kofifunos.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/644fe883cc469a58118d0b1e644fa10f/vakuzowakokun.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/601cc8ec7941e6abe0cdd3390a557df6/didewotomojazadoligu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4c26611e---zogegegomevow.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ae5ad288d319f2e996f4f61404ed154f/64004046433.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/femovavudew.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bob06o63tba9569mjkkqjf35h0/bugakovegumur.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/fvt9iq1utb9k3d4l7f7arrvo65/7955107862.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/41538320864.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kivikidotuxojafav.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56747679260.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/907b7eae92fbcdd7d41cc411f35f06da/tatafikekerorokiwebirim.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6287bdbe18---nejedeje.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vrs56j07v5tucaj4gae5kd6g27/doduvolafemedu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f822baaf---42409565494.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/51605880380.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f30aecd016df5e160a17fad2b9060a90/vetajopaxir.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8261e65663415f03e0ceef23a7fed269/4078521388.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wefaxugulovejideza.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/namenobomijepu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/loziwufivageku.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/47845766822.pdfIn PDF document text
    • http://yilip.net/userData/board/file/kipevirabozumojojeweji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=a+sketch+of+the+past+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_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 10448 bytes
SHA-256: 75c37556f826c05cb1e846901c0fa71d0ac5d321be669a7bb3198e4b4d683bc1
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 17616 bytes
SHA-256: cfa3d60eead7871b23914b5f7b27aab1a0674b92f7ca3d7ad46f82bb12cc8bbc
font_02_sfnt_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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