Malicious PDF — malware analysis report

Static analysis result for SHA-256 140197996f7ac4bb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 05:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 137a6847cccef837fb190f025beefbb0 SHA-1: d8692bacff5e8311179a4c6955d3fb2d0f8cff22 SHA-256: 140197996f7ac4bb55d00a87795f8da96d35d32f661c9268a1cb6c034059b851
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zeminyerkaplama.com/upload/ckfinder/files/58698989158.pdf In PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/pivololibife.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/10027613161.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/27658169276.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_050224.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/1930573589.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/74687160029.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/pebatazuzobufimanezepepip.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/vobadikejabis.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1b1366d78d2528bbfac0c16a0dd55692/tikiken.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4dad99eb---wesodoriwututefusolonorig.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/wakebisat.pdfIn PDF document text
    • http://humanlitech.com/files/files/finagasekiw.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/mopudoniwifozirin.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/dobenowevobowasimopurewup.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903222609.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/11058785064.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/rivijivavupodi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/16961625922.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/35200933002.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/fesixagolisobinawadapoda.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/37692534563.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/30856212126.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/o05k5tlb4gnmneutmpkbnr18ef/74992878691.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/zawususakokutidiru.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/remakozigokitiniwepemug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hunger+games+mockingjay+read+onlinePDF 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11040 bytes
SHA-256: e1e5bb12844d4a24cfa1522f31ae1222211c096a4cac7ecf4ad41e657c4fea6a
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 17352 bytes
SHA-256: e436d1e0509812da3432d2ccfc118b392d136e9c0c306d3e9f7b9f540646be46

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