Malicious PDF — malware analysis report

Static analysis result for SHA-256 7189c2b3e232c772…

MALICIOUS

PDF

90.7 KB Created: 2021-09-07 11:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f01891960dadcc45d1388cbc34cb368 SHA-1: 5f2129b76177f57ff6b5db13e911d493a2f05f94 SHA-256: 7189c2b3e232c7725abd60d39367fb1cf2282baa229844cfb0d30109ed483fe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggests the document is designed to redirect users to malicious sites for phishing or further payload delivery. The 'appositive practice worksheet answer key' lure in one URL indicates a social engineering tactic to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=appositive+practice+worksheet+answer+key PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52c181553---xupob.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/32359a1b4e00d1421eaecabb387ddc18/vutuw.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6d48be1150f7aeed0de53a7270c9079d/pudibemiwanabegodaj.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/54620955554.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/40835223385.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850a9f161e2---lawidilibuninigixatogu.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/zitaz.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/sopemeten.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/77798298186.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/fobol.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160825a47b6835---pofoman.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d79cc604097d6e62c587d6e422b0bb9e/zizutavenunifomijumara.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/jesuzufojezinisigeg.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/72568718361.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/37925829087.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/ripugujanuzabosajelame.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/97974380526.pdfIn PDF document text
    • http://jfe.hk/userfiles/64332214547.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1804ecdc---fipavonosepugoraki.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/nobubulife.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612926d1089b6---61504830239.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pvrtusqc1fc09gvb83bbtsjdq1/vozuresiruf.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/fuxer.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/boworafofesabibemed.pdfIn PDF document text
    • 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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 10764 bytes
SHA-256: 6d9fb310f34a2bbbf60940ff3e4b573967338e3c81fdc49db3050363be44783e
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 17952 bytes
SHA-256: 347f359f95ff7a85e9efbb71454ec1661db23482338bd8f88a108896d6116ae8

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