Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58540186ad9b361…

MALICIOUS

PDF

74.7 KB Created: 2021-05-22 06:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2027b324e0572885e79f53c9eba6e955 SHA-1: 6e5af16d133059b9f6616ccda1a87bd38310ed9b SHA-256: a58540186ad9b3613092a2dcf1603685bea947a193e3bf19658a941c01efc912
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8080

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607701429aa54---roliloz.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f65e8570dd66f9339e4cc0aadfee1a85/95425164580.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925dad3d49---zoxov.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b399f3df13737fbe64a1bfc5221fe1bf/tuloboratotixobezarerib.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8460d3b1e8---35857552387.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717d242fbe6---garebotedixi.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c156ce2921---35193689910.pdf
    • http://apexibd.com/uploads/fck_uploads/file/zevuzabikixu.pdf
    • https://avonsteel.com/UserFiles/file/94913497069.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3a33d99f87f62aba1eea66d14478b030/62297267518.pdf
    • https://steklo-shik.ru/userfiles/file/xatewejalimakifupijolo.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8gr81ufvro50fqlmo0gb77n2kf/pugoxepirazasu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608156c1c1169---75971983314.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a9d494ce---mozimeregata.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/vabatow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=estudio+inductivo+de+la+biblia+efesios
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3f.bin
5fccc4b93669808a911be510fa35354615011d06cae0a9a774c0ef2e9a75b465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 2828 bytes
font_01_sfnt_off00011649.bin
db2a8934d71fe41e14fc98d8f358d8b02f744b19d10cd2406e270fa39b7b1ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 5076 bytes

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