Malicious PDF — malware analysis report

Static analysis result for SHA-256 7537ca357a8d6e67…

MALICIOUS

PDF

87.0 KB Created: 2021-07-26 21:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 845813249b4959787126142849aa01a1 SHA-1: bf1775fe91472ee662cd16e0267abe2782124cf5 SHA-256: 7537ca357a8d6e677bbc78d64c1230fc93771ca2a58e6e90992a9a878e722f40
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on compromised websites, indicating a malicious intent to redirect users to potentially harmful content. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ijp2.com/contents//files/peramakom.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16095420f3f58f---vuluguf.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/ganejumuboxibuvos.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/86978025800.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160756eee4fcca---81415135644.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kpo54r8evt0l2dqcn38668q045/98675027654.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a7b1f6c5---60211129396.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jebekolo.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/juxagewije.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/lujamalazi.pdfIn PDF document text
    • https://dineflon.com//files/35742888223.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210722_E600F8525034B7AA.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7540ac18---penedifapegagub.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/nogasiros.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cdc9a8aa18481490e82c8d82b1dbf51f/barusupaguvekazu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/filatanufaxuxitutojib.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a82f3ddcff2836aed0bfbf9fad54fb04/7643791900.pdfIn PDF document text
    • http://orrizon.ru/images/file/xipusubabaxajubu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8ecacfa0---2268062960.pdfIn PDF document text
    • http://hangquangauto.com/files/febebojami.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a536d25a---18972073013.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/palajexufirokufeliwove.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/75a98724860d9556093bb62a2811b874/nivuwamumoxamakopipoza.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/niruvijerokimuwajetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+charge+soundlogic+xt+power+cellPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 17528 bytes
SHA-256: 74086da835a33ca39b35410f3549ee5dc261f8d1d9537b8b43abe48000770082
font_01_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 11072 bytes
SHA-256: aad0adbb64efdd2b8d0ec5b4c165e4beaa25ed2d0bacb3dcd7b5e952748af43c

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