Malicious PDF — malware analysis report

Static analysis result for SHA-256 49763c69a98518cb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 17:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fcbc789b184da34dd9f56b0a1733f64b SHA-1: 7eba9ebcb1d191a252b6760392817b6b2562b58d SHA-256: 49763c69a98518cbdea3ae0d370a4c3e35edb1a8f409237f0d280cfbabb9e7ff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URI heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mehmetrasimmutlu.com/icerik/file/limot.pdf In PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630906369.pdfIn PDF document text
    • https://austarpharma.com/upload/files/29101575028.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/wukojitufuxunezogek.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/40181325591.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/gonem.pdfIn PDF document text
    • https://brs.jo/userfiles/files/21843756842.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17544b26c---70393644863.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/16951229933.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/disabo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/14827381254.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/titomaxubakuzatimegug.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/tazilujabidi.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/bemeti.pdfIn PDF document text
    • http://kme-kme.cz/files/file/jiluxovadivegoxulugebat.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/61251178033.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02f656585---tuzebigurogebu.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/34524522595.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/85891907144.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/90188825149.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136ebb00d7b8---digelodedowogowodaja.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/mosunes.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/52425198761.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_041042420D2AFBB0.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f8ac6af13f2926793cc352b331137c03/27606811810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=it+movie+download+linkPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 17152 bytes
SHA-256: b27ace38b870fc8824070d9ae27de3947cf293d6d23ec943db1ef3db86ae0aa9
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10336 bytes
SHA-256: 33b9500e7a74ede2e1f45f59a1f9fc507ba40fa5d117a119a39b6e390b49d081
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1