Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e1e2c4a68451e…

MALICIOUS

PDF

98.9 KB Created: 2021-09-18 06:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 139a2bbb6445503bc6901a54320ad5da SHA-1: 12a0261e508e7a717b39b1085b0e1d92fab51b74 SHA-256: e50e1e2c4a68451e449fb09c25d93d544a3c252a110a3cf84b2562f04a7a7340
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/88387107993.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/61028581555.pdf
    • http://cesishotel.com/res/wysiwyg/file/87517807658.pdf
    • http://trivio.it/userfiles/files/89635700943.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/dovaxexukoki.pdf
    • http://hoangduy.vn/vn/files/folopagokodixixawoxike.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161405b2581719---lasaguretapudapikigemimo.pdf
    • http://pc-driver.ru/userfiles/files/39023867089.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1e5a2ae4---divelere.pdf
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/bejugonegeved.pdf
    • http://littlepearlbooks.in/data/eimages/file/tizamamewivowizu.pdf
    • http://elitvorota.ru/f/file/26518980914.pdf
    • https://greenways.at/userfiles/file/29098752697.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/39434556058.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/16403270227.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acb4be626---ruperipixoromoxewe.pdf
    • https://betalinktech.com/blmedia/file/vixavatosejulutawo.pdf
    • http://majortaylorride.info/images/uploaded/file/zegeromuxezewanofu.pdf
    • http://kovacsoltvaskerites.hu/images/file/mapifixilol.pdf
    • http://maulich.vn/attachment/files/97493245504.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/90348200595.pdf
    • https://sieuthimaytinhcu.vn/upload/files/bisoxebatu.pdf
    • http://baracenter.be/userfiles/file/41651180856.pdf
    • http://pazzo.jp/js/upload/files/gizijefuxana.pdf
    • https://ip-pharma.net/data/files/69338402438.pdf
    • https://buonoantonio.it/userfiles/file/68816567143.pdf
    • https://energooptima.hu/upload/File/ledulokifemonuvoxizefin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=popcorn+time+apk+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f7.bin
367314406a29608f71712b5abb6b88f305d69b23056480dac28e00db12f84a70
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 19080 bytes
font_01_sfnt_off00014c1b.bin
1ad0bf5e1c2cd1f5ca86958f769591cdc1c6a7528b83fb65221c2592e92e36be
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1B 10980 bytes
font_02_sfnt_off000165bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x165BB 16792 bytes