Malicious PDF — malware analysis report

Static analysis result for SHA-256 910b322b18ae39a7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2b85ac912830e4bf22707b3b5583e2f SHA-1: 842652091482b9714abf1c366f36ffcded3222ea SHA-256: 910b322b18ae39a7e7e82175c7b09bfbc8a47922edbd38acdf7597398dc15bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. 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 URL patterns are consistent with malicious document lures.

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 https://smidgel.ru/uplcv?utm_term=best+manual+video+camera+app+for+android PDF link annotation
    • http://kystar.net/filespath/files/20210913023818.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/bojavorawisevodo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96f088364---vilivu.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/12853820531.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rabaxumadasilinurosat.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tomutamezimuvi.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/wozidojitulawufewur.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1ef2086e860b302f3e02d810fb5c8e5/27177129582.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zixelozaxabikumi.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/tonixilomibotadokel.pdfIn PDF document text
    • https://adium.ru/userfiles/file/83963787801.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/tanowamamokivirekiwoj.pdfIn PDF document text
    • http://petrduchek.com/files/pimunaxo.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/48123093495.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613444d87a8f1---8609326787.pdfIn PDF document text
    • http://dsraxys.com/uploads/51567174007.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb63bdf52a---memaresawezuwunub.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/24951217894.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161361e5b4c93c---zikijizagoloxasava.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/24863488569.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908052509.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bumug.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/49042072056.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_off0000c053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 11000 bytes
SHA-256: d5c5d16153cb4ff0d14cc34a2f521300b83088e4758151242879ba3819cde9b5
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 17668 bytes
SHA-256: aa91f1689f77d37ccb27a9b4f1b636cb9781d13520e90efd38ca40f17e4d4126
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.