Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fe194613928d04…

MALICIOUS

PDF

72.3 KB Created: 2021-07-08 05:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d20c1ab04a30dfddcce34b774765b8b8 SHA-1: 4b986cd40d99da9382ef5bb88ffc6e0fabb2e481 SHA-256: 95fe194613928d04dfe641d86915846cf77a18493ffc198f4692c4108086dc68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=local+time+in+est PDF link annotation
    • http://fsanaq.com/upload/file/210629114835890626ez7vko4aikvy.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/jeteditukububuxezigew.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/giruk.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/64398953834.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d722f65db0---tosaxivagakazemozopaz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082667a2ee55---xilebenuwanigunoriz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad97e63856---vexavajigegenoxebalu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2910b887ae---93671477189.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/44785466072.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/471cd6d20204ed76972529459eeb178e/37500943235.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/37999428367.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/93718118482.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/51481840043.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/58139910574.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93c895069---sixume.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/56919441823.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/liwufegonefujizixire.pdfIn PDF document text
    • http://gtshotel.it/images/file/87389172675.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jukuzavosixisodirexi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0f3c4f2a---wimagebifozajomikofunimo.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f8abd314---tifididafozilewumeje.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609c715b4877b---jumogurixad.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32334927192.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_off0000ba48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA48 16468 bytes
SHA-256: 565b3a71f632266950299d4c7910f1922c4b56f04d1025cf6f0b7dcbb0e5ac4d
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10248 bytes
SHA-256: d3363f3b597442eff4f687536b0aa6c0345bd22f6fed187e07b287fcf58c7ba1

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