Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be5ebb492bdc0cb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 19:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de9f3fe646324452de8797c00b680600 SHA-1: 6b49b925ca17b567114aa3764530e61ce340a359 SHA-256: 9be5ebb492bdc0cb6c31e0cd92906691426b7ca4e5fb0add26692f5a5b7d24c4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links suggests an attempt to distribute a payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=shadow+fight+2+premium+mod+apk PDF link annotation
    • http://chongthamphucthang.com/images/news/files/gutibesenujoluwafoxi.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/66822190208.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/dosawob.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/fubalidugijijezubetul.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614055d378fac---kofomuretotisalebobajib.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/lexoluzowipatamiterizam.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xixumibu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161368922d2595---77935175020.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/xezamakosufunigap.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/nisamuxulavodip.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4987b04c1def69506e48b09e284e2dad/85345863710.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3a106aa3---gegegunak.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/55671782184.pdfIn PDF document text
    • https://pecsikult.hu/files/file/73429676907.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/xubizanifumonizezifeparob.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143aad484692---60821438595.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/putaxewipenap.pdfIn PDF document text
    • https://durimawar.com/contents/files/13775620299.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b2c2a3f1b99a64d1f4acee8682eec644/5391048929.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/72573934555.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/novoxokivutufax.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091605504327.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/6640981594.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/zanatuxeworudefiwil.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/vaxonefolumibalavep.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_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 17724 bytes
SHA-256: 6279af4aa2e0889f849387d653f9418d8ef33de9956c885af00b22e0ec061fc2
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 11100 bytes
SHA-256: 4a58fb74f8005129bf1df5fe7c9bc1fe0e631e3ca3e024a0079e90134885cc7f

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