Malicious PDF — malware analysis report

Static analysis result for SHA-256 0078e80b9d883f1e…

MALICIOUS

PDF

87.6 KB Created: 2021-08-18 21:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdca4a7d9b9ae39f996f0f95ddb7e861 SHA-1: adf9a6b5f99cd4062a1f7f4c76473ccc4c6854f4 SHA-256: 0078e80b9d883f1ed30212d0f5b58acd2de2efb7cb53b5fab9afc1d777251093
156 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 heuristics reveal it functions as a link farm, directing users to multiple compromised or potentially malicious websites, likely for phishing or SEO-based attacks. The presence of numerous external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://alshaabcoop.com/userfiles/file/kavafer.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210505161356.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c0c83dd38e014851b1c745ce1647bedc/vejebewijakemosa.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sevilatimokixi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2be9e3be2b07e7b10baac10c6f1193f8/28145863137.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/91052111906.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/xuzizu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd28ddf61---2479732934.pdfIn PDF document text
    • http://envigest.cz/upload/file/jabupubu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/sasogipuzevurarikosot.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c804ca5d0---tebelixidutuvugegazer.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf0faf286---fusek.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/59109341647.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/bugag.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f231a7824---ponotezil.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/clekb7lgke6n47dfplt29o3s66/148880154.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4q47c2tufvjips4ra975abo822/pazuwopozukepikuk.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de2e31eeea6---datodagumuvebedileduwodo.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/tilixaxa.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/geagfv6p0gpkb9hng8bjbfqai1/ruxugodarezokedo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/bagalonabagewumasovewos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+does+a+medical+scientist+earn+in+south+africa+per+monthPDF 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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 17296 bytes
SHA-256: b34fe99e1dcaf3362df0d86952dee14e93b0cfeed9082d07735eb2831168d968
font_02_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 11064 bytes
SHA-256: e0ef97c332cb9b00ac36a44a1b6c596367486924861b8a81d2ce74a16a75acb0

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