Malicious PDF — malware analysis report

Static analysis result for SHA-256 259f391f79296a91…

MALICIOUS

PDF

82.8 KB Created: 2021-08-30 05:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 724763c2f0d453c39603dd94b02fe108 SHA-1: 78e81693e9a543e26e247dc51ac19e2050b15ec0 SHA-256: 259f391f79296a91ee89f5ddb6d4e1fc38857d8f316a3fcd7b93e5e1d682cbd4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this, indicating a sophisticated redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://charontrade.hu/data/file/riwerofewe.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701ff2b32c9---bokowabarudunigupikabowu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098e3ca2e84d---jotiminilujutapizimobetoj.pdfIn PDF document text
    • https://unosms.us/userfiles/file/98673382000.pdfIn PDF document text
    • https://puppometalli.eu/file/26210225118.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nok5lampgmmkq7gk5sqog9gj1n/nusojafan.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/rexafudixunudixukawure.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/kivewefozekafukulefimodel.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be471bd2376---sofijirilenejak.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf767d5a---33646227078.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/sirejiro.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/natoxu.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/vupudijaporanegigij.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/dulazewedejufufelepopefe.pdfIn PDF document text
    • https://codecs.roimages/file/jexadadidajodano.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasilewitedeguv.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/11877929592.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/504150368.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d1f437d74db01c2038e7538fcc9657e1/26965455813.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/eld6h8f8pelq47f4qfingr7p3m/1123585853.pdfIn PDF document text
    • http://mebco.ru/images/file/subolubazojujud.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/fabinelapudaxasofakibub.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/luxizenumokur.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5786d22545---53298659706.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/mixogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+a+gf+in+gta+vPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 17356 bytes
SHA-256: 9647d53fc0f62421d19da3074ab9da8efb86666f9244c6e01867a0293ffabed0
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 10216 bytes
SHA-256: cfd68f9fe739a1aff5de096a9b8341e964ecb69806a45f20c979e242dc90d2f8

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