Malicious PDF — malware analysis report

Static analysis result for SHA-256 129d53524c648508…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 03:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0afb9b221513aab52d97e890b92a90db SHA-1: a67a85ef84b340e043832b94f148ef7e783d8597 SHA-256: 129d53524c64850872a43ae0c835a7bea979c70aac77f11a67ecbcc95175761f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised CMS upload directories, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bidwoodmachine.com/d/files/14157473773.pdf In PDF document text
    • http://canadanur.com/resimler/files/wovaro.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/36736857597.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8416c03afa8172badc60fd4b38c6c0c1/kenunu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/52814542523.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/nubexijirudapawubefirav.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/gisezupatebikuvurido.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/zazosak.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e2b7cfd393bba69dbc164cf8837ba0fc/mesobav.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/85288967987.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77f77b001---32068086002.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/joxirep.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e58207501---gitirebopozufena.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/41618410927.pdfIn PDF document text
    • https://masukpt1.com/contents//files/kiteruwigamowaleg.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9655a9f9e63f6b61955d5c7091de0b40/74695878315.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89002556550.pdfIn PDF document text
    • https://ibextrail.com/editor-images/51660558301.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/vurelukudamelegoretufe.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/42636652595.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8f94fa4f---41225787916.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8kngjrmob4jr5kf9jcufg3te2r/12880104733.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/vevinetuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+boot+verbPDF 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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 19600 bytes
SHA-256: 4181ca92e4fffd33b25ffac626f4d689b179b556c2d9850a676a109a150e745a
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10252 bytes
SHA-256: 77df3e8b88ec84e0aa8918f0f50b6dd637c1282ac549399a1f6e65abf9fa83ac
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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