Malicious PDF — malware analysis report

Static analysis result for SHA-256 287423ca5fb1de13…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 21:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fe438e7cd31e5ccc9d1e059390155ba1 SHA-1: 6a06289f350cae51b14d9994c641804edaf17081 SHA-256: 287423ca5fb1de1302d79bf11b51ba56ec85165e7e60f05df8e59749ca89bbe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://huntic.ru/uplcv?utm_term=introduction+to+heat+transfer PDF link annotation
    • https://fwullong.com/upfiles/editor/files/88235111811.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/61887046848.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a33143e---kuxerenegevijewazuxab.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/df72835cea82a5a70b28ffa09a039d38/69427603521.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88e32ad6c---97097962834.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/4790446097.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c0927d7ba---velaxenebepugexedubi.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/nawudokomalu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/58182951207.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/tuxowijofavizikimog.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/913216440.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/aref9k7oqfoa05grlf9hc8l2ft/soximasefunokob.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9bd1bb63b8dbe9967252a9df89782979/90027357837.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40fdcb995---67564267690.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/22968331083da7daf68af13674167255/85822826403.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/34167965940.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/55ec4f9618cd80a6d9ec03b4a3f4d55f/56609128943.pdfIn PDF document text
    • http://akademibt.com/resimler/files/21251440339.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082021976bbd---64356376559.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ueamfpk7holetnfjsubvqoinnn/gonaxosibe.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857646ae4e6---tedevuguridijuweni.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723a45663fe---44588014902.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c140e903c7---konafotosasatin.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93352d828c---25543347230.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607890c71fc17---73567428115.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_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 17032 bytes
SHA-256: ba4fd2a71aeb5a652e31311c40edb85227892dc6181e8a62c85bab65d40a08e0
font_01_sfnt_off00014a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16294 10580 bytes
SHA-256: 9c8383e8fa9e93f86a69e297117a6dc96ab4512b4b352cb1b91782480e41da66