Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04929c7dcd9b5d5…

MALICIOUS

PDF

82.8 KB Created: 2021-08-26 11:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fb98483e5e3fd894be5a1e14aed9cab SHA-1: b97b09a2637e562ce40741f3631befed67034207 SHA-256: c04929c7dcd9b5d58fc5330c2b750a69a52f2a1dd493bbec0bad90cb71edfe74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/26380smeicijh69uhciidiqv5l/12751986990.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pmadk28n7hc3clvttdu6lid761/46188161790.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/66497246372.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/65715022016.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/gudujebemimodigimaz.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/giruvujiwikoruv.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb060e128c7---zonur.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/nalebufiziwurizejux.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/26536611044.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/1645744336.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/deweripapilu.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/kelowupugetuz.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/9601630807.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f64dd4a8---razedolo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/82493114034.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/xazudekolunonak.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/49988147487.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/66329530043.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/62535053276.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/totaragaf.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/dasabax.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2e058845---ruroxalojasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=4th+grader+state+park+passPDF 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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 10380 bytes
SHA-256: 68bad72d11635ba2a43eff7c3aaaa868c309e689cfa186c36dd0bbe95f1592cc
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16924 bytes
SHA-256: dc83c6bd456d364c8dc51354875d930cf1e1c95709e7a597c3c4d95eec259853
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1