Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a966ae9d33a3877…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 01:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0288d14ab19da6cb0cc45f239aa07eef SHA-1: d6d3a8264743a202eaaef73cbccff723c998fa18 SHA-256: 1a966ae9d33a38779545a48221864c8d6d75de47cb9292091887fae8a712c1c9
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous compromised websites. These sites, in turn, host other malicious PDFs, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, with the URLs likely serving as part of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=fce+practice+tests+pdf+2017 PDF link annotation
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7e8f349b77ab9b6b2b75c153be870fc7/foxomujixesal.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/9984742182.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c611aea0---5999694686.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wukemu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/bomukuxonopimevepozaxawa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cc62ac66e9cba27b2178e3e5904c3e1e/63695784641.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3a59e5fb0c9e089737b507d455220e29/ludijozalaf.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/xonavel.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/nujolepevepaj.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/purezajoberigasujedunipu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/71064533783.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/bosun.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5f382d69d4fdbe3001872bbef1a54f37/visaki.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/60445318561.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c157f8c8cba---xunumiwadunawuler.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b41ec877dc54e43f88e01f3b1ce1e552/67902878032.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25101965658.pdfIn PDF document text
    • http://bakoca.hu/files/file/nipipawududap.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/41389648595.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d6a67579---duwuvurawomi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb62405c---texajamo.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/wilokalevoj.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/gugagoduvuzunoroko.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/wudiladimomupexifoseragu.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16484 bytes
SHA-256: ce7f40af21edf9a081c76389cd3757a2b77f61c3480c64b8e42359a94f3f8437
font_01_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 10664 bytes
SHA-256: b1b99c23b84ebcbd4dd3e63189ffa9ba891ad3f1e2f096827df8fe8d6f4db169

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