Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c9bf3d4af8745f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-01 13:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab831b94e79de723301e94e172766a47 SHA-1: 8f8ae21f24be9d291267e8a4ebf7e357fe84ff9c SHA-256: 68c9bf3d4af8745fc6fd550d571aba4aa7c5e1c0b4ae715d479dfb3b6e7c7276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a56924632---zeraxatobataveximaxov.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9bfd2554da28fbf3a95dbc1f3b6b96a1/7156668718.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xugabaroki.pdfIn PDF document text
    • http://mamam.by/upload/File/file/46005776301.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/nuviki.pdfIn PDF document text
    • https://daismene.it/file/35156746196.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/002dd58719efe1ddbea899ef8ef146e2/42712969700.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09a3c2377---kubebilafipoxezixa.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091420dd5c40---logewexanesibonijeramubu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bopedimudadipel.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/10521600938.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd26b04974---64618485112.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/311kv333lju619arjvb3v12ouh/bitojexovinebibozedi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2b9c31f7022d0a730fc320ebc07b3a1/xevetos.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/52614504007.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/vumezipubezomubilenef.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/75517457402.pdfIn PDF document text
    • https://steammining.com/userfiles/file/59967737444.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160868d56313d4---28211293392.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/131d100e747b936b23e6caa158119cd2/51648135515.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/7c01995a40d8bcaf9f776f9b87861273/23982809922.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/62562473972.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/be33d5303b131b7cc1168176e35e0128/90643544204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=genitivo+sajon+ejercicios+1o+eso+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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10856 bytes
SHA-256: f96389fee1645132eff8defe5f60208890011eab449a72f4045e36886b53d8bc
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 18792 bytes
SHA-256: bd002d74253ce2ddc4a799966fa5f9a7c77efa7e5089d0e8d0d7f289915f108c
font_02_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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