Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e3fa1390d4fbb4…

MALICIOUS

PDF

79.8 KB Created: 2021-07-28 07:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4c9c65de04732732e5c2216ee727b891 SHA-1: de0bd1a0f7247a800e834a95301badd5b60ef2eb SHA-256: 89e3fa1390d4fbb42842970cd0ff64ab16b049038caa8b564a48820287e73f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/38752745559.pdf In PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kujujolizofifedibupiso.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/19959600271.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/55425464398.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/fc990a1b9d25dcf7e67f65458d811998/jolawuxukan.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6gkf3kvcid0bp1lpub6aptattm/zaxojope.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960aed8213a---21835904744.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/wipikajevoz.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/pabanumugejidotu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cmabogfk8e25godmoh4ortlbr7/demaruzevimumarozaxir.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/ponogelosusetibigadak.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/fasevutabere.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/40b80f4997ef9105a4fded1ed2e74cbd/92980417840.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/44816429551.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/dupira.pdfIn PDF document text
    • http://nakatka.com/files/file/3322368678.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ad7984169e037703ea068d70f4bb2a28/69979724963.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/50816465496.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90095da1c---43335736664.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/10678203334.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/31668296026.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/dovivaxajevebaxameruto.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1203a95fe---lexewenenozaz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7e22b38d---85326477673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=multiplying+and+dividing+fractions+online+gamesPDF 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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16328 bytes
SHA-256: 9d5fecca823772bf2438412826615a0433fd9c0882515a15c313e343c69541b5
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 11236 bytes
SHA-256: 9ecbf5d830179d1043ab2a3c58e33ff6181b9730abd6549f3e1f66076dc3c158
font_02_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1