Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fe4a5a28486814…

MALICIOUS

PDF

68.7 KB Created: 2021-11-13 04:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77dff9b6306914027af00890716b1c1b SHA-1: c3dc2e8390ca1a80d12d88eccf13b1e5f47c2116 SHA-256: 07fe4a5a284868147a90ccb5e66721dd1bae4b4efaba507c833491645d84a1f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://asupuro.com/user_data/image/file/pupevobekobafefabogawu.pdf In PDF document text
    • https://dukupahit.com/contents/files/juxavidifakixaniwu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/52974745529.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152bc3e72564---jogifuxatewej.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/repet.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16159fb14daa57---35655427701.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616bb9337299d---21237591402.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/xonuwidumotenemed.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/4188469472.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/34761461324.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/17ebb9706f021fdbfe13d91829976a14/ribuzixovitagara.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/viwuvibona.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/93655383873.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/37275445782.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27891561655.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/xozalipizafozedur.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/70140034156.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/be515ca9ef350c4884bd007d47735d2c/20420926600.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/dorepawaguxujojimajuw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0ff46532---vefusitasirisufu.pdfIn PDF document text
    • https://ferropula.hr/files/1818907840.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b1a4e37043---zupeja.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=what+is+the+law+of+segregation+in+biologyPDF 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_off0000a8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F9 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 17064 bytes
SHA-256: 87bdaf0cc5249857a1991b7e11496e8d14b7540fc80e1a5f294dbf4c067b1656
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10828 bytes
SHA-256: d652b7ccb25c970cedc4d5df7ece76d32c925452292e27b3d45412f28735b78d

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