Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7f8d06adcabe6b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 19:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04d1c94079e2e86ccdc508f9662bc8e1 SHA-1: a19bf04faf556e607e32ab711af3a1c434a3fc37 SHA-256: 3a7f8d06adcabe6bf96d09c52f094ae3aaafb3278ae559dcaf5bb55c5f3a7290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this, as these are often used to host phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=playstore+in+laptop PDF link annotation
    • https://yptea.com/data/fckeditor/files/50451757490.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/xozoforuxerikuxuwewivin.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/43270899507.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/21649642510.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zovefelelaxidupojo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcaab6c25d---59305349856.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/volazedigigugevi.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/safezabosi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/bolomobasixuroraz.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4ue9vubkqr95bgnfv83vmt2soa/kevotozidapobosuloxukimo.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210909200224.pdfIn PDF document text
    • http://dolonchem.com/upload/files/mamumoroxotitusaperu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/28829383420.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/luradebukasirobeza.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/sejogafidaruzabisesova.pdfIn PDF document text
    • http://askort.pl/Upload/file/xikojodikojolufoxixozi.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/bodakezudonukisesodot.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f082de4b777c39e93d85761a58b85d42/waribonajuvekuxib.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd2016348---5839363862.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/liketudukojotezupifonod.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963246fb22---ditef.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/pelusomolowupomon.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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 10360 bytes
SHA-256: 78a0ec96a25d7fd13d90b6f4dc03bab75654962058969b44b5ae9e6c5e4d9262
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 18028 bytes
SHA-256: d56a3f7a3012d111d5fd0320a1dbf34e8742cdf58562fc6f69000a5d496438a5
font_02_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1