Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ae00a2ed38e37d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 16:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 190dcdbdb755708989b76fc795ccd0a3 SHA-1: 2997724fed410c32fc7bebbc18ba1d01ccbf52bc SHA-256: d7ae00a2ed38e37d0cae7d5794ddb9de02413f70fc6990147b0504a1e588b0d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it is used to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=gfx+tool+apk PDF link annotation
    • https://minervatech.work/js/ckfinder/userfiles/files/12678342058.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/99151551372.pdfIn PDF document text
    • http://soles2walk.com/data/file/weganurovetopujekokuju.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/fuzobi.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/pazusubuxomuxozolam.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9aa6c3f12---jekokugiwagoxoropas.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/47535143958.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/64233232563.pdfIn PDF document text
    • http://eichler-kammerer.de/rizaxexonabef.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/dodopopemukalukavezawexox.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/sizavewolobetem.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010087413a---solaxatoxapuw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/12800400171.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/sifodo.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/16220713117.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/84205441939.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/28846156990.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d1508570---45653466383.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_102357.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/94585459315.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/zipopedebavi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/28493151936.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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 18592 bytes
SHA-256: 9995f25fceb8cf9450ea3500407332526c52b38d0739114b877890bc4a42ad28
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 9988 bytes
SHA-256: e540a51ad8abd119c26efb84f40c44fca86dbcc472d5b72e20f9296333a28788

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