Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7107164dc1ad095…

MALICIOUS

PDF

143.2 KB Created: 2021-07-09 20:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 653056fc3c59a391072fd0161a1af770 SHA-1: 409d0d359e40ba619c9ae6d66dd9f73147215afd SHA-256: e7107164dc1ad095f6ee3f186c01e94a1b38caf84b14f47bac02b4974dd3413e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, suggesting it is designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700777d153d---90980842908.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609663032e4c0---974596844.pdf
    • http://sbs-group.co/userfiles/files/bawuxesomap.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04652ed027---3652040035.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be182d892b---37170310376.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3cfd45849126716a8cc3c7a28c2424f5/xewelexakoxejimakusu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab91ea58c---zixufumu.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/44760912873.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/883433be6a7f6a8757511de6e27220a2/98937479587.pdf
    • http://kyanite.tv/userfiles/file/pitatipojunifofijijija.pdf
    • https://stallion-international.com/userfiles/file/gadoruwonululapi.pdf
    • http://chukysovin.com/img-svc/files/mejixuraxudata.pdf
    • https://ikima.fr/uploads/file/zulavifujugoxadamanudisop.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7e688c5d36f4872d131c43ab375b21d/mogezo.pdf
    • https://clumba-indoor.ru/files/files/gumekozibuketile.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a715f855b9---lituxabuvonipatuxa.pdf
    • http://adamlegal.com/userfiles/file/metapezikutisanajisigu.pdf
    • http://vekosgroup.ru/userfiles/file/97305242048.pdf
    • http://sewakendragroup.com/userfiles/file/tebabo.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/zozubosilukuk.pdf
    • http://haohanlegend.com/Uploadfiles/files/jelemobupovosinofi.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ud62bvnbrsuahitohqagme2kcm/48220024401.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/potiwo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tom+gale+hypnotherapy
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/67f10bf50cd06d92533708b381f07fe2/nifazasovubesididupozirem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFF0 16792 bytes
font_01_sfnt_off0001e802.bin
d9311236e8469d4ecbbb875970d4f35afeb943bd70c572c1173d2d51b179c87b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E802 18320 bytes
font_02_sfnt_off000217c7.bin
110b2cfbac985cdc3224c08a019dce4f3da8c67b4b5f5d3f3fc7585f8286f4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x217C7 10516 bytes