Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f907a0228e828ef…

MALICIOUS

PDF

70.3 KB Created: 2021-05-06 20:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d244c5ae69e7bd8a3b2ee535efdf1921 SHA-1: 3007522fe20e43122ad0f20eb568214b21b91550 SHA-256: 2f907a0228e828ef5d3ad202d1b5cf195d02ded8571768c52a062f44951f2402
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection scheme to host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7739

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085940794a58---maluv.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430142638619542.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c9da7efdf366fc041630cde90650d508/39507500096.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/10030071293.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ac5s6m733g1gmi7kgo619b7mul/68650481333.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160937e7cce7f4---69218214821.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c823409071---gafasawikosuzexovavum.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/r1cjvt4i4oeoggaotlfcu65qv6/11560597213.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160732d0428a67---farafipavakupom.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/bvp5256tmscntvcghrsbhb3d3m/lumotom.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720b79541e3---sokewuxujigavorupepasov.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f4f8829605d88777ba8e6a44223d045d/zewiruneveb.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d79eef5bb7188d531748e3906e0934b0/senigukofesajivadib.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6ffe6584---50107111712.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8cd8a5079452093ce7ae5bb0146b74c0/vexizubatibipu.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/5f96ebadc96a2162ca48bffebd8be3af/xudemozezalasuxojosi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=whirlpool+chladnicka+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a5.bin
32cfcdc2621a374a643ef868f95d8d9ffd8c9a6ca5611ae6c18376053b8f13cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 4896 bytes
font_01_sfnt_off0000f10a.bin
adf8cae2e6bee6a1488590b58ec0890a57f525947dbcf2b7abce5c3e1b2f5ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 10592 bytes

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