Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce42999e7d7d31f0…

MALICIOUS

PDF

128.5 KB Created: 2021-09-05 12:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 961154ebc01a4b7f0927f629b88805d6 SHA-1: 19bbd8ce9ad9ec02e78154b5666ee53e4ce4d231 SHA-256: ce42999e7d7d31f006c90d843ace669e551c94a3a0754d5dba08d1cc4b7293fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or use IP literals, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points to an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=sd+estrategias+de+ense%C3%B1anza+aprendizaje+pdf PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/01af1bcd34e8caf5da783f6019029291/sipaxizofofu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946cf144c03---20524474184.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/77493689061.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/83864431464.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075943e7ddf5---fipitemuradite.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae9f75aeb---mirinazez.pdfPDF link annotation
    • http://bortran.com/upload/image/file/20210727090254.pdfIn PDF document text
    • http://getem.pl/files/file/27148343351.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210809021118_zgv8g4.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c738b6ed58---teniketowixepatonikope.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114fe9e4a73d---78613481661.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6d7e9b953e52333449497f4c0bb29b67/zoguse.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a9068155e57c2ebf51231c4ce595a917/77054673335.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/55f70ce718485a8d86c7f5253f9bb53d/37642703873.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/84211082406.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/24017406718.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2f0d1570c---laruzuranademisuse.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092a763cc6a9---fisujume.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/5700183407.pdfIn PDF document text
    • https://denimder.org/resimler/files/pekedudimuzuzabegif.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e426a899---82595018338.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081809413397.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2cc9a0c9902bf2ecfd6b03edc9004b12/lejof.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/fitezomu.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_off00018c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2C 20728 bytes
SHA-256: becf48ed400f5f4a4b4cd495951847cf74ff0ec9677abae9bddd15c3d386f4f1
font_01_sfnt_off0001c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C084 10976 bytes
SHA-256: de519934c0a2d8e1dc744dc3f070ab3ae531eb381418e3d11ec796094fa53fd1
font_02_sfnt_off0001d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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