Malicious PDF — malware analysis report

Static analysis result for SHA-256 991fc42b555a1108…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 10:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd6e44792c02094254b9a680483cfc85 SHA-1: 4776ba43ec52bc21244f5462e9a4358240ed4732 SHA-256: 991fc42b555a1108cb1a8d71559322aab34952dafc8d114daf4e57646bd4e317
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains identified as disposable or potentially compromised. Heuristics indicate this PDF is a link farm, likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7819

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 http://busankid.com/webfiles/board/file///felijuro.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/tufosapuxusorinavuritoduw.pdfIn PDF document text
    • http://jkohut.pl/file/sodekifilo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86566c1b53---69153853490.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/67417481491.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/9365231311.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jr9odmpvu5vfvpbcv42d8ia754/bimijivajibujasokedazaz.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d800309bc---rotupolitagubotek.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af3df0388---motomaporadina.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/31791229294.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/28356891504.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b11b6684464b24e66a7f381515c93790/xogibebupukobanuka.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d1127aea---61175736361.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ece244ba4---zijerewo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4f719277c794988d9e5985a55cfcd4d4/pazajisonepomunatajasika.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/keworosepepo.pdfIn PDF document text
    • http://cosyromania.com/media/file/kifowolebas.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fab0c16aaf4a82c45b161892a6a00da/zemujuwarunanemuj.pdfIn PDF document text
    • http://ux-school.ru/files/files/jimifuwav.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/80580884298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=find+font+type+from+pdfPDF link annotation
    • 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10376 bytes
SHA-256: 19b08270a1509216df2a04529febb5fa659c32cff35a51ef8599650e10c64fbe

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