Malicious PDF — malware analysis report

Static analysis result for SHA-256 3447a8239accc4eb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 12:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 187dc629343f1465f303cf42eafee0d3 SHA-1: f98d10dceff1dfcc90ce4d5ba4faa7db34902ef7 SHA-256: 3447a8239accc4ebffd2b5e8c424e60d2e01e0473e57f075d51eb5a9ad2f6243
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=hacked+version+traffic+rider PDF link annotation
    • http://dsraxys.com/uploads/57922111378.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161406fcf3edae---lefipekexuwup.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/20aus8cr9t3gtuo72ru1rrgol5/73176254534.pdfIn PDF document text
    • http://brukbet.com/user_images/file/zazirajimoluzopi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a2deac1dde51d2a0c75c8b0dd567de62/92583046162.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/026862490ef17e1dd34b27b146390467/posoturazijolupixil.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/15934015501.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630731695.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8061874f---33513193131.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903225327717.pdfIn PDF document text
    • http://entrackintl.com/uploads/sibexogarakidup.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/36404097241.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0b0abc8c---vuzebigamidowalifa.pdfIn PDF document text
    • http://lawngo.net/fckfiles/4033240694.pdfIn PDF document text
    • http://aa-nusd.jp/49044940429.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/vifixov.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/12928802262.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/vigemaxufujomunizuda.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210921055011885.pdfIn PDF document text
    • http://teplospectr.ru/images/files/remujolamuvovilumejokaja.pdfIn PDF document text
    • http://tyextractor.com/d/files/gategaj.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/70900856358.pdfIn PDF document text
    • https://combrooncom.com/contents/files/rewoki.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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10572 bytes
SHA-256: 6e9327910da9bab5767cd530376a8df179e21a9fcc190c55d3b54028f490a268
font_02_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 17340 bytes
SHA-256: 105487ef7724808b482b27f1b0a87174a3db0cbe1b0aee68e65559c0e62244ac