Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecf3d81a9ede143…

MALICIOUS

PDF

66.8 KB Created: 2021-06-02 02:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34dd1c4870da1b2dbfdcac684215fec4 SHA-1: 3433781fe3f3adfaf9e2e84b498ff5e8fb579a79 SHA-256: 0ecf3d81a9ede14302229b0de5a1d157b238800f7740fd459f97056412c26534
154 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 it likely contains an exploit. The document's content is presented as IELTS speaking cue cards, a common lure for phishing or malware delivery. The presence of multiple links to compromised WordPress sites and disposable hosting suggests an attempt to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8307

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vorne-sitzen.eu/pcms/content/file/zadimapida.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f8c5b50a---35304113723.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235d447895---zewutalatesevoruvukadapo.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abd8837cc---jurexumoxazeke.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1aca46f29e0ae8d4377f7971dc44dad9/bipejinitavuloxuwosewewog.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0de10c551---58799674558.pdf
    • http://busangh.com/attfile/fckimg/file/%5C/202106027568_899231940.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3246f5b83e8a2e0a45355236529b624a/55753382991.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833bcf4536c---vapexatifivebovofoba.pdf
    • http://acpiindia.com/userfiles/file/vafenulekubit.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ea42cf9d---mitigolulogiwovotodibiw.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac60139dd---72067219978.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38dc445676---83793881744.pdf
    • http://nordicaluminium.ru/userfiles/file/sidifutewifukaxa.pdf
    • https://allcreaturesinc.com/files/files/95866676502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ielts+speaking+latest+cue+cards+2021
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3a.bin
5e67f8d06e0f85a8d393adcdcfbdede965d58b3ef79fe91481557deb8fa07a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 5568 bytes

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