Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8a338a90465cc8…

MALICIOUS

PDF

62.4 KB Created: 2021-07-16 05:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cac204979bdf99b73d3642afbb52187 SHA-1: 9a61a425b37ddaeca242f46be336497c8006756a SHA-256: bb8a338a90465cc8aeeb42fbf5ef042ae4fc57678b060e2b098a93022f1930fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7357

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://archism.ru/uplcv?utm_term=notes+on+computer+memory+pdf PDF link annotation
    • http://scard.vn/app/webroot/uploads/files/lufopivatu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8064b158a---ligukupaxujolobituvonu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fc7778bd991a97f93d0b6cafd7070b29/62378583429.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6974de2b2---93561868931.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qiiinf06mag3k4shvu4oec4t6o/muzukuwis.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/78907248423.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b870b6de1---73261391464.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ca4e30508c34e65d5753415ad3960cb3/tijuv.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///93320708630.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/39850523866.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607886864f14d---lamotovisosobubufexasal.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/71608476702.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4c7056bdbc7ffb9aac2763c256b5ee39/59232748555.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/girubiwetol.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/savodudorabekuge.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e0e0225264bf998fe878c17819bd40ec/30158208979.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743415718bd---bupifag.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/zirofimenizodanixulirof.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/novawivaditoxosodiwizu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/41a42b9a4ec0a442bedf72f4b4cacabe/zekejevexitezoje.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/88336156674.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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16668 bytes
SHA-256: 162007721163f8fae831d21511239b5452e71cf1a98e8213847f1b7603f3f4d1

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