Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae218144b2244e8c…

MALICIOUS

PDF

88.0 KB Created: 2021-07-08 13:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9fe0841c452b38b0d7665dc5f2ad9e6 SHA-1: e8fe5d2657cc18ab09423d8c722d544d86159c51 SHA-256: ae218144b2244e8ce888a9efada272b4f061abdcd000c55ed58cabfd041032c3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qmj939jpb8quj31kt8knkiae7f/tefalijajudelukego.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945a9fdc5ed---60003057986.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d76544933938b61691dff681f32627bb/novim.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1e0370f1---jikofidiragop.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35abc4957---wobesovokajiza.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/a7bnqup82cgjrdptjkp5va717t/laladuwadarivebari.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cf54cb50---46999887623.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/t8mkm979e4l3t6dbs1m0h6heec/49690424291.pdf
    • https://foundryindia.org/userfiles/file/nobibemowixosuwor.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725138ddc4c---limitivinimajitunamube.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/9664b9755d2f79239161eca436b44533/30798316489.pdf
    • http://alexhofford.com/temp/files/file/62073312012.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b300a1036---bafod.pdf
    • https://nedimgame.com/calisma2/files/uploads/26463324429.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/30fb150abe30b8cfa926a8877b9588f3/lizake.pdf
    • http://szintai.hu/ckfinder/userfiles/files/87731299659.pdf
    • http://mppscstudy.com/admin/usercontent/file/63164732040.pdf
    • http://narcisse.sk/editor_uploads/files/xenapapurizogonalovo.pdf
    • https://alatheir.com/atheirwsfiles/file/53368755945.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c6e679855ff83dc3546fdb79a43e046a/fenubodugisuv.pdf
    • http://brezov-gaj.si/uporabnik/file/18715263817.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4ef5b5b5f40e3c3cf6718ad3b16232f0/wuwilopazabuniwo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f8d283d4---20177889241.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ebd4b0e12390c0c8b658205b8912e8b5/vilisapubuguxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=parts+of+nephron+and+its+function
    • 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_off0000f61d.bin
f6e46158322831a4668a39f91d3208e457ce77c8f009774207bb0baa5ff4ae1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 10772 bytes
font_01_sfnt_off00010edb.bin
3650ffc5b97d142968a27ed3dbb80a71d0376ec3183337a07ad4cdedb15e1d94
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 16740 bytes
font_02_sfnt_off00013a98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A98 16792 bytes