Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bbc35d7718b616…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 07:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50619ec6f8495f2a9a189723b3bceb08 SHA-1: 4580b0bd50180cffff5906277b9c5deb648ed22f SHA-256: 61bbc35d7718b616cec4aadaf5c28f8280d66d6add4e911deb1235d82c3b5cc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=composite+function+domain+worksheet PDF link annotation
    • https://acgroupenterprise.com/userfiles/file/61818932388.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/44b19009a38ba4a78f48192502cb0b05/ligix.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/fevomafekeme.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3500ed4478---fipapobipedugixat.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/48396943498.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b5882a22be5---65877743717.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/59282844964.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/21465950596.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b121f9d6b71---revitusumuve.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609288f4a422e---56535877784.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/joludezisibujolumat.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b315663a7---dikivinoxosajepug.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/14547518831.pdfIn PDF document text
    • http://ilkemymm.com/image/files/zijotox.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/xesikokak.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/5ce0b9ea9f4150ce9fd812709b167543/wumorizowusirilu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lrstsepnggohp67f14d8rqtki9/84208636898.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o7bsblckh9bmf4bt1oacp7cd0/vobiralujitogalipixisesov.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/todupakos.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/p0tnak8vugmr9rk8lcq6mg5jqb/xevidavakeroxugisoza.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mogemipuf.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/dekalomuki.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/bupojapozibifozitojuti.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/latuse.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/mokubaxekipewenavetejum.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/68a704c7a0064f956ffd0cd4fb7e1ded/tulusated.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528085014544241.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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 17036 bytes
SHA-256: 38c0db78247b2e462f45e68d287c5751f14e4199690d2c68dadfda3e8c8a4296
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 11148 bytes
SHA-256: 640f739a675bd4aef45c0548661fd7666ef3843b4870202e0045ee85923c362a
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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