Malicious PDF — malware analysis report

Static analysis result for SHA-256 167cf1f7ed433ce6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 14:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0983a25112e1b31f039f3927680f953 SHA-1: e060740159c8b74d4f2fead6835ee5bc39832efa SHA-256: 167cf1f7ed433ce627b3fc683ce982dfaa718c44f8fa1c138f9128258d905253
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links and the overall structure indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=kiera+cass+the+one+pdf+ita PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073874e7fdcc---kilakivoditevoxulisalomib.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d328954fbdf---81766508547.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/sijusivitosa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161128f4fed73d---95027434000.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/95991332622.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms41d9ur0h08p88agh83a3v0nu/17701966179.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/44079837037.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/82688131954.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/19517396154.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16093e15a0966f---62698719494.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/lifuvameputitogifegu.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/sajufomovaleputa.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/79841700571.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/28042327927.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d513053635---jizidemoxejarawo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e0cd69bb---34675542999.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/17123315655.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/96782168490.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/33285905940.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/zapipagafugoluvimod.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2c2337e159accc141ceaa6aebecaa569/58524619429.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0ac7954a86eb9007f06225e80d35a38c/26405330905.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610659f51c7e9---berajajaroj.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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 10664 bytes
SHA-256: de18d6aae28908352823ef8234cffae331d267bc227ca53d9d7d1741237b7166
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 19348 bytes
SHA-256: 0d7499f80239094ef391cc177f8b03de29ab09ac9c0dcda9d2f989eaa23c3f46
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1