Malicious PDF — malware analysis report

Static analysis result for SHA-256 916ae7b847aebd3a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 18:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 962d7731e602cd354aa23cd1226953c7 SHA-1: bd61f7e14381ac5a6cd0a9ac56bf36c580141304 SHA-256: 916ae7b847aebd3a6453bdd588d63eebfa364a05fc3c8cd4ae09cb8f9ab98957
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://globalbizkorea.com/userData/board/file/60535265925.pdf In PDF document text
    • http://touristclub.in/userfiles/file/tuwetigijujoviwinutu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9424c18f---bubozelilezezujoxarepixap.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/57916036138.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a76055f23---26063802996.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/puwogonubifivijekifen.pdfIn PDF document text
    • http://brenderup.ro/mm/file/moviropoluvolilakuv.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/51948259158.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/90061004053.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/85111042707.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/pokixevobidoxifamuk.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e886f03d---91796674698.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/67706650962.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/81270669679.pdfIn PDF document text
    • http://knipia.com/userfiles/file/21661835759.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/72499922010.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/93186894521.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fafedd6886e904c4642477eb4b65163b/86462996993.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zikelu.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210919_0E9F90C1FCD9F2FD.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/29766547187.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vulud.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/97346920256.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4c806af1---vimorarejilusoxojawokax.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/62200031730.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/3572725113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=online+bootloader+unlockPDF 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_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 16348 bytes
SHA-256: 0751f51e2062aadaa350176c25273095e46be4029767078abb7ca20ff021c654
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 10552 bytes
SHA-256: 9fee244fb290847e2868aaf2915be6fc10bc7eb27d26545ab6aed400be448990

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