Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a038c67cc90d92…

MALICIOUS

PDF

66.4 KB Created: 2021-09-15 09:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87ecb5883e777e29ae98ff49c3c890a9 SHA-1: d59789169fa0a392dab08318bd7e597c07bf25f5 SHA-256: 40a038c67cc90d924e54b3c15cf73759b6a86747aa236ddd4977dbf960cbfa16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 5

  • 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
  • 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=free+psp+iso+games+direct+download PDF link annotation
    • https://astefin.ro/ckfinder/userfiles/files/tolupovinonamulamomij.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090301075573499.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac308dddf---tarasoresevidop.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-09-56-36-51.pdfIn PDF document text
    • https://bdata.vn/upload/files/rotolevesipetolode.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/pemuwosogiwazudedoromok.pdfIn PDF document text
    • http://stroi-sistema.ru/img/pukivu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7b688e99---likurokokimotu.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210907032001.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/llh1vmrtql4gjumm2hajcalkkg/rudamobigekifimobeji.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/87923692987.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/dabufaba.pdfIn PDF document text
    • http://minerva-collection.net/files/files/63969084336.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/59155042035.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/18481902188.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jelip.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8e945ae2379c70cc203cf5bb3bc0b106/mixasuruwumazululo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/bivudalagizojosemaxi.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/fepaw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613083a5e107c---81120649302.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/giwafezoruj.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/74728178131.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/zevagasabivinajemagu.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/dukofaxo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 10920 bytes
SHA-256: 3c9f75fc68ed2fda06b365bb133201d26d1714e8c3bc06ad6f979c78220ecdbf

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