Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21f14f8cbf799b7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 19:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd0478164eb70494bcbd7b4e87ddf914 SHA-1: 83f33663f0446200ebf0215e3f5c38d5a4e85e6a SHA-256: f21f14f8cbf799b725c3c415ae6f35211613f710e0645f9f65a1b769d62bafab
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to external URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to host malicious content. The primary malicious URL identified is http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8gr14ek5lar5kpmd8963acjgv3/gajida.pdf, which likely serves as a lure for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8140

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hobbes-group.com/upload/files/89959386220.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5ff45f3651a7320444b85044cc503829/nofijiwudebu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/60794720671.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/rugosumuzokas.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c91553ae76---pekuzoxejanurade.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109040004411045.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd63e9ddd---suxajileworujusaturu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ef1aecc1---68865556183.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e9bed978---woruro.pdfIn PDF document text
    • https://carlojans.com/cms/file/gekiwi.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210826171425.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/kikenajazed.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e8dee687---fapitigapuwiza.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/74258568776.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/80630450748.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d5b998663---vojabofulujaj.pdfIn PDF document text
    • https://wrd13.com/force/file/87426709931.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/79349450318.pdfIn PDF document text
    • http://mextro.de/upload/files/ledesukupozotuvina.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160832050cc091---42214325636.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/77cbdb39ed27357cc4384a9ad4a1a040/wogamajunagilalasa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8gr14ek5lar5kpmd8963acjgv3/gajida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=journal+of+computational+and+applied+mathematics+pdfPDF link annotation
    • 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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 10976 bytes
SHA-256: 125a706338778ebc107b595c7b3d824417459460ab5a466efd9a534d87ed5b39
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 18552 bytes
SHA-256: ddfe51abbdc49cd3bd360e4a2875fe6bb9673a54835b34cb35bd9e59a34f954d