Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f44c9a0225613b…

MALICIOUS

PDF

99.3 KB Created: 2021-08-07 02:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 335932a6a917501c7728c1852647fd94 SHA-1: 26fedc5c591b5620108d443647b1bef145eb56d4 SHA-256: 18f44c9a0225613b5c7e540296ee07a94473f1e9e9b9575eabe9bb66d1ad21bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • 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 https://irlanc.ru/uplcv?utm_term=randomly+become+vampire+skyrim PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f637e39b3cae3cb8ffe3f22dfb9e56b3/nimekinogejepupefexazobi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/78e547e87f30c6afefdf82b3151cc4dd/74387113328.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/dfcec3fe807f918d605f3c48cec6f7d7/kulokal.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210607145451.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086923c5afc8---xukofuxozukabate.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/60524302028.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c199606b6b5---lijodetekenupoked.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/majepowi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ebkovvgflq54pcnnbpt1rga1rc/medawutenijazapuluvizi.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/6911963965.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210807073312.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/nudobifagudinof.pdfIn PDF document text
    • https://area5srl.it/file/tezuzejovikibabo.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/dipevonudarisilexol.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/034efdd075487a6f9e3648be1d039693/pigulepowasavumam.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5516bffcb---42860194318.pdfIn PDF document text
    • https://drsaman.com/files/xofepigurolevex.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/91244200010.pdfIn PDF document text
    • https://togeltop.net/contents//files/24909816450.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/60731499239.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/buvugitunuvosuvuwaduvi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9bb68874---2364982937.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96dc82b52---51852606551.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097112e22a3d---35876385996.pdfIn PDF document text
    • 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_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 17316 bytes
SHA-256: ef8fdef58b70dbc07d28728707b274443c1eb2b43a40a4b8648d249444a551e5
font_02_sfnt_off0001645d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645D 11032 bytes
SHA-256: 5d82246f4811fb6912605f104c35d832580b9762d76ce541da7cd1aee1ff492e

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