Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4772c7bb1ff126d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 08:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e02551b64c49969d54bbfbc22b3a5d07 SHA-1: 42bb7a690ced3be0462d382a51f1fe01b3804a93 SHA-256: c4772c7bb1ff126db288d46e7a4020b0cb174b42f46abe8fe0cf3c6c5ea7a885
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external links, including those on compromised CMS uploads, suggests an attempt to lure users to malicious sites, potentially for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chi-kara.net/userfiles/file/76500868665.pdf In PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/bevodutarogevomipisosoto.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/u9dr1ales317ob9f4jfi21gluh/99485105372.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/89095649804.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/86605888508.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/mowaju.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/h0n396j94n4ck5h4s2rn8a3012/40843692596.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d75b0eb85---94381261254.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/ximewuwuv.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f93b70c5f95fa425c4dd98d0f462819b/72819672885.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a79910cd03---nutisuvemuvuliroz.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/kulidapapepexolufifigux.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/876185164.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f316b98d84f5dd5e85c56f8bbace1b91/jinelitiremonelika.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bb804326451---winamewenazexexivivulas.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734eb687ea5---momuwukogurofuviduma.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0m6vvndccpl5iol4gq6873b8at/tobevefux.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vfobnmngvup2jmq475nhb3lb44/11580398845.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/7786306682.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/wixobesuxeromiwibawopo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/baviduwatopakag.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210618052251.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824406be9ba---89553341175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cardiovascular+disease+symptoms+and+treatment+pdfPDF 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_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 11092 bytes
SHA-256: 0494e206686e89d62874e7f6db8095404f44e6dd3ec80b1612e74061f2c73536
font_01_sfnt_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 16684 bytes
SHA-256: 7fb392be787d2dd187855d5e4f4ab3c9d0958c73bc3ce6a27ab98db6ac87d8d1

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