Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bad4e7616abe338…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 07:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5433d0620db951db6c8434947ce3889 SHA-1: 4109b236caf186090ffd30585d9a46374626c3b0 SHA-256: 7bad4e7616abe338f431b0f295790f23f8f8ed6274cfb89374bb21c3eb54db00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to trick users into downloading further malware. The presence of multiple external URIs and a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=android+battery+monitor+app PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v7ei213ulu0fh7o2hhusee0aj6/19651304966.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/61204449020.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/dusezurevupajapa.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/wipuz.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3f87997d---43867706665.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210909_205711_124.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/lununikilirozuvezoxesefon.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vonemepo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/76212591509.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/zivobemuli.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kifuwujopegunit.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/36905018571.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301bda5e44d---27738591637.pdfIn PDF document text
    • https://beautydent.hu/editor_up/39292337130.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/giwuvulabagosa.pdfIn PDF document text
    • https://fishboat.hr/files/jedubanijafazeniz.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/josimo.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luwotelirowadag.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/nofaberepup.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/gokajujogolawola.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/3173909258.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/vokuz.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pajes.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/ruzexaw.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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 17116 bytes
SHA-256: 86a534c09c1e46f653fa9a30c774127bb8b516aeacf08e1b980cb4b745cbf65f
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 10572 bytes
SHA-256: 1a3ae0b95d6a69755b06a64bcacabcf52286330ea247b3d04343b8fa9a3fac1f

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