Malicious PDF — malware analysis report

Static analysis result for SHA-256 f933e433cf8bbb08…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 10:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ad13a14505bb9e163fc761111fcd652 SHA-1: 8d314ad2765d30dc7f458b8a8cdc3247e6c3fe4e SHA-256: f933e433cf8bbb08e4513c5b9dc49b73c246d353fb308a7413795f6c22858b95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=where+can+i+stream+hocus+pocus PDF link annotation
    • http://nghiencuuykhoa.com/uploads/userfiles/file/jupuresozoneka.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fuvijojafegenapigub.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/fexeminidisefupupobifawan.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/36674845041.pdfIn PDF document text
    • http://master-br.ru/img/file/xevisepel.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/96911379538.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/tovewikajujumi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace75d1baf---68029126854.pdfIn PDF document text
    • http://cpviettin.com/upload/files/jikob.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/gubadisabovivibalirorug.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf46e5398---73402662374.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mekasodabe.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/sinesotida.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf4a1540---60589103562.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vofog.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bafoxiseda.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/bisojolupobativerob.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/83880372248.pdfIn PDF document text
    • https://davnosti.ru/upload/45299228460.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/90537683966.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/wumizigo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e610c1ddbb---numuwogabikonutawige.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_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 18632 bytes
SHA-256: ed0c5f1aa48467b1b9d8285b69a48fd84909ecebbc15edfdd019b894a3cf1ba6
font_01_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 10688 bytes
SHA-256: 669d7f15e7c49e17eae6c075ee02b3ee5c0c44653d71bb4e8060212c92205044
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1