Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e3abcbab80d93d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 01:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8d68cfa4c2bf6ed945f115cab7f3f7e SHA-1: e17da0bcc53907ff4986f6d5572f228aff1988d0 SHA-256: f9e3abcbab80d93d882b27523a6c1c24d2e0e4e9ea93b3026b2d2d264f4026e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://crewmak.ru/uplcv?utm_term=catalogo+ngk+pdf+2018 PDF link annotation
    • http://bpabv.nl/uploadfiles/file/50729518798.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/89883501962.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/dazakalowipomulirid.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/ratinifawujadulo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93dbb6b94---bejuxetemaxowade.pdfIn PDF document text
    • https://menu2uplus.com/images/file/7789800932.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17422467b---83538747857.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/samugox.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/12092274007.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1c9ecfc8d496df35bd76461d1eaf203c/25130430585.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/98487770778.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/43877726326.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/61682772764.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c340d9aff6b---sazawokog.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fabowadigiwutilisonezeru.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xusotabakazamipebajise.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mmt9j41optq55ns54eqb0erqt4/nebinigamibodolikuvunalem.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/dcef87d648c6e7a4d8995a4ebfcb3e65/simizuvonalobuvafovu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/26970035025.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15c38f9ca---60044667149.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f39ad865---jizuredupaguw.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20788779854.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1398fa6875---69693436267.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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 19816 bytes
SHA-256: 928fe98423dfbe9bf7bf78b7b3d70314745efcf7c6d9b27b0f71aa6c6f78ce36
font_01_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 10804 bytes
SHA-256: 3090f74c1f3d93e4d0ae379299abfcbee929571c50b66a825264d78e61bae11b
font_02_sfnt_off00013fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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