Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc2e8bd5d2016be…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9780999976ec3896ef0525b988f88f54 SHA-1: d149ff998dac6fd48f16173148db497e43ca39b3 SHA-256: 9dc2e8bd5d2016be30424276eff3e251dfa86d0e6cb096b21a2c2fd1a66b2642
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm or redirector to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9539b284---giresaxe.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a391ecc26---gumepalovebusedufozixiji.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rujuvaxatajasajixa.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160861abc63fce---73369648701.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jj8i3e7v2oc6qrgno53l2upbcf/talewobugimisadolosusex.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd07ae30d6---25791345020.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/80283099958.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/nixox.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/dokunaguvexisorifevup.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/11748280991.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/4f5b5339a6f0f23afbb86612b9c8a892/79403599134.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/benoninopavofetojebim.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/53648788389.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dtadqopb8fh886nufm17tiut21/9628659569.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/27129125467.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff3988771---26991950861.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/85994404485.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/21587281255.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/52104397195.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/nidefizutu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sebigunuket.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/sixotob.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/65468278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sistema+respiratorio+humano+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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 20332 bytes
SHA-256: 1c6a4a488be367642459e53c5b2ed99fb99224c10a844f56e2c6e1d0bb6e843a
font_02_sfnt_off00013ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CED 10892 bytes
SHA-256: d35523ca7fe9d2920d0522a44567f3c98b3fecb27b50b71722a4ea939d2936e1

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