Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da0b7653cbabf7d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 15:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c55f70490310b90d3f7859b70d4d2256 SHA-1: 688a5eaa9fadb6bc5653fd0d057a4b986f10c874 SHA-256: 2da0b7653cbabf7d5be24e8e94b8cbe437dca9da3c3f16896d9cf671cddeed8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The primary function appears to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=rotary+tablet+machine+pdf PDF link annotation
    • https://ruiguoex.com/upfile/files/2021/09/05/80894095511.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/viloxuvilo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/r1h11mju8h99f1qv2tgjn6nd7e/zabibebibu.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///28346038748.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/83409606094.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5fd91328bcdc858d5118eec6a0f1c337/37267029891.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613500aca5760---bizozupajarolazevezeve.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xaxelanibaf.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/5177143788.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rinojasaga.pdfIn PDF document text
    • http://modern-pro.ru/files/file/39525387938.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/tozeteverivojixarenevo.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/novugajimiwurogu.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/54390190301.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/29086572687.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tenimokasulolufim.pdfIn PDF document text
    • http://vtaky.sk/media/file/nitus.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/rajebunupolifaziwakev.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/dikevewepoloto.pdfIn PDF document text
    • http://8njl.com/userfiles/files/1777921220.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///rarujowufiwatezolabekalu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2f98c4a2eac623c9989664625f04fe9e/wejonerimefefedivi.pdfIn PDF document text
    • http://baoveantam.info/upload/files/52796535115.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dofuzewu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/doxepitafesufazowafijeta.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 11016 bytes
SHA-256: 002e1df840688a7a0d074d5f95df3137732ea44b9b6abffdd72b4b000b972cad
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16992 bytes
SHA-256: ae24bc420bd93e190f640c4cabd29b8065b9bb3893e827f298d7aa730045a05d

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