Malicious PDF — malware analysis report

Static analysis result for SHA-256 976f978bba0e2f7b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 04:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fb359474b545b465c0138c1fe5dc558e SHA-1: 1734fab242fc689e6becd7852fb5d578a129baf0 SHA-256: 976f978bba0e2f7b65f5c869ceb28feaea2159e45cd2004048258cd27067d60b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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://garglob.ru/uplcv?utm_term=mahabharatham+tamil+pdf PDF link annotation
    • http://cameradungphat.com/uploads/files/tuzotexodubutimowabisobul.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/totogab.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/15282989991.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/fabotilibuvipotasifonik.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/35546928011.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/8520725027.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a4f4e66e---85478726995.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e731b3d7cd5---zoxolumapekerewogigaxezep.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/nezavelewakute.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d18d8dd8f---40305201462.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/7157061932.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/99867088402.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/9372502533.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e249b36332---42296028675.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff41177b7---37021471810.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/bulafeneloworowunituwevo.pdfIn PDF document text
    • http://nfc.soo.jp/file/fazasozitozilewatuka.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/fulixisupejaguvanuneno.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/81769112491.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/52613343591.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/zajaguzogemono.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jfj04si60buhduuurh78nuh6q3/58433508057.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r0vl7vc2b7ta24ugoqij77piag/96474551229.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/53820406504.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd83d25a7dd---18349010262.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8e88fbdde540ce5b4cd4a0bc6f5ecccb/3756732157.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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 18964 bytes
SHA-256: 4d5199617257ae45c66c72d01ef907ef5d4c0b80085a6824f1e213fbb00ea1b6
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10372 bytes
SHA-256: d8942a965d036c76e0888d1c5353f1daa036622224b09326665d0f41c8d31c15
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1