Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b43273c11ef893d…

MALICIOUS

PDF

88.6 KB Created: 2021-08-21 08:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05f037faf4b8b23f437f9a6d89887502 SHA-1: 42b68bf048d2c9d15216ffbfdcc0a7054778c22e SHA-256: 2b43273c11ef893dd80f18826d2b2b43fe785735b0e68ccb0ff4d6c4ab2c6a48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious files. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/e4m027nmphuaugcoovqm27n5e2/19088194401.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5d69d93b2a2df71cd63db80226d9e4ab/89360725892.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7912bd489---82021017844.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b281f0b06eb---69577696249.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2871nlcqogbqrc35rf39547l49/raserupagidotuv.pdf
    • http://brukbet.com/user_images/file/xujix.pdf
    • http://www.awakohchang.com/image/upload/File/obis.pdf
    • http://matsonconstruction.net/userfiles/file/80689778404.pdf
    • http://ketoanantamhcm.com/uploads/files/45334919235.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609919addfd8f---jebegenugukuxa.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/99164974463.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab1d69cc5---zujolamugikozagu.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/scgj636reqtoiorohr5cjdorr0/43363943621.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/modetititapaporutudikak.pdf
    • http://cobansut.com/userfiles/file/rawag.pdf
    • http://etalentlink.com/uploadfile/file///2021080819031017.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/31777529380.pdf
    • http://rc-mst.com/mst/_upload/files/49121319443.pdf
    • http://kkitv.com/images/upload/File/sajuvijuvegixafulufetuvi.pdf
    • http://twtipa.com/upfile/files/2021/06/28/viluvaluwatazasuvinunini.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160871eabaddda---75836678727.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad7866d20---fodudaputosipivujuwemug.pdf
    • http://iaestedresden.de/userfiles/file/fivosuwovuve.pdf
    • https://asesoriagade.com/app/webroot/files/files/76822429690.pdf
    • http://agendatourvietnam.com/hinhanh/file/13555955890.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=assassin%27s+creed+identity+apk+full+version+free+download
    • 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_off0000f041.bin
9e558142971772d29e2374eec60e70196dad3bb517c3eb699e18fa449ce058ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 17764 bytes
font_01_sfnt_off00011ecd.bin
f52c3c3c6c24e9c314fd49cb31dc361baac786396a09fc1cfcb0d6c08120a9eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 11088 bytes
font_02_sfnt_off000138ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 16792 bytes