Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc94b798eb580387…

MALICIOUS

PDF

76.6 KB Created: 2021-09-27 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9226c77394439796dedf1c3d1dd17a52 SHA-1: d99aed76e9180b9b826ee12d735e78b79cd76bf9 SHA-256: bc94b798eb58038707683106566d58c0c89f0f299b5e538fd596487a0917faec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, indicating a potential for malicious execution. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://deshdunya.com/blogimage/file/77897192687.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396167b5135---31603732415.pdf
    • http://aftp.bg/userfiles/file/texezebemulejo.pdf
    • http://abnicum.com/files/file/depiwufigusarade.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/kesegekafadifosoduzoludex.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/33654540906.pdf
    • http://v-lukomorie.com/uploader/files/51116333379.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2d1170804654440351f42fc4f606264e/66199960258.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138762d89e64---tovaruwetedatipobozof.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/73746868570.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/64257586848.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/luduvovubuvutamunafisaza.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/zigalojorosixevuzepet.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd260f43c---panonivujusupak.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614554515b39b---vunojapevogutaguxuxe.pdf
    • http://nct-vn.com/userfiles/file/bobipajobobubezumifulowe.pdf
    • http://liqaa-lb.com/files/userfiles/files/19652682656.pdf
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91583287846.pdf
    • https://angkorphotographyguide.com/userfiles/file/27623296184.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/febabujisipevifo.pdf
    • http://dogoducthien.com/uploads/files/perowuzizezurasazin.pdf
    • http://interstyle.org/content/xuploadimages/file/55067215781.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/jimonikawuz.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/patemajikibon.pdf
    • http://ngor2-3.com/file_media/file_image/file/74330766864.pdf
    • http://www.tamtrebinhminh.com/public/files/96653503411.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97578862817.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef5cf465---fivonara.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+midsummer+night%27s+dream+essay+pdf
    • 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_off0000c428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 16792 bytes
font_01_sfnt_off0000dc3a.bin
2f9fc622591399753c7d30a005db14df26445177bbdcea7d8d7ddce833a532f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 18216 bytes
font_02_sfnt_off00010b0f.bin
c83c1bf7aac2f365c1fb09dc480417f95911949a416e97b5d5d8f91f4a2a3991
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 11008 bytes