Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d85aad855ff46a2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 12:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c40b39ff3cb2fdd9bc72fe400aef45a SHA-1: 7be10994b09be1c1f68c9bde4185be421b90ad96 SHA-256: 5d85aad855ff46a2f62c8f8ce46bb584cf21d6fa3d377aaa3ee1f0052fc159bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing an image-based design to conceal clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 72 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/krin1o4vb96dioglaa5kadq1e6/43020783626.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/penefuganugunet.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b71726f2897122dfb40bd37dbdea1158/jefilekovimezukanefaw.pdf
    • http://dancedynamicsla.com/clients/38740/File/69126920192.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b200df2c8c0---9034271267.pdf
    • https://kaptenhoki.info/contents//files/vapesademesejuwoji.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wurazofubitel.pdf
    • http://files.ibiza-ferien.de/file/xawipakodakorosuwasup.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/kabuxizitepuvogude.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7982ddba---zobuwenuz.pdf
    • https://gymlesgeants.com/upload/editor/file/49426165997.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6c3f857731844fbd61a3f83480775df8/kerorofaw.pdf
    • https://ribaczpeter.hu/files/file/fakaledevotalazim.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximire.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/97m517d6mu7tdcgt17bin55cnl/5318763612.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f94861afe---pumexigumukepo.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/122e8690288227b68218028d8a588f16/nelewixesozig.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/328146eada8ddceb309b70c8003afb52/zedifur.pdf
    • http://zuche0551.com/upload/file/nukifatowa.pdf
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/70206039743.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05c584fb9---rimupukuzosegosamoku.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/xalesomeni.pdf
    • http://chalappuram.com/userfiles/file/kivijulu.pdf
    • https://rent-1.es/ckfinder/userfiles/files/13258514893.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=stress+corrosion+cracking+theory+and+practice+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_off0000bc25.bin
371e92af594e24fa443c39276a8d7ddc2af6f04ef6390abe8b25ca196f450548
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC25 11132 bytes
font_01_sfnt_off0000d5e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 16792 bytes
font_02_sfnt_off0000edf3.bin
4eee71c96d6493e6a84c9d19b5e957a62086ee4a912d4aac9205003c11742998
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 13952 bytes