Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa289095f6a689ea…

MALICIOUS

PDF

104.6 KB Created: 2021-09-07 03:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04baa92b4ae44cd68f81615a6ec4953c SHA-1: c59e5e30458aac4544c7bcccc6009ff6747d80af SHA-256: aa289095f6a689ea442a3957ff43ef5d8d3c781baec33deeddb69328e6285b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories or disposable hosting, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://betenagro.com/sites/default/files/file/wawapid.pdf In PDF document text
    • http://www.leasebridge.com/CKUPimg/files/62564530143.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/gipujisowuberogofaxaj.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/22152523584.pdfIn PDF document text
    • http://air-con.ru/upload/files/31792537692.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/powipunelonuxifuvo.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/38539735165.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/24881706228.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/temofasu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/sagogomerirakigebe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e26c6576d43---4934898669.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78568222763.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/4265202563.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zasubuduzarigarumi.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/setalizobekejovonij.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/61323461793.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3faf93e4199b36bc17f112fc85d031b/2029879407.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55fb95dec---vukazajefuzetijobudi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/jexikikigused.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ef974750---jilenelutamuwevi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/94e83df539664128012dcf67554e4826/15855674348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=arbor+day+worksheets+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_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 10764 bytes
SHA-256: 6c97bde4b2d9d33d9b334bb9763ea6a572e78d939964c01b78687caf8be26cae
font_01_sfnt_off00014608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14608 20528 bytes
SHA-256: 65bdc01c5b969f1f75f53578c9e90ca8ef77ca38570e1370d7abbae3a307de30
font_02_sfnt_off00017c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1