Malicious PDF — malware analysis report

Static analysis result for SHA-256 4337ca43ff3e8e33…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 08:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d350afbb18ac8efe481d6a9f18e3397 SHA-1: 73c1a4774e9eab68f9c7db7e3f286e272e34c3ee SHA-256: 4337ca43ff3e8e33b827234075d2a011180a4a166ad262efb3e82ee361c25db5
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://griby.biz/ckfinder/userfiles/files/57843766876.pdf In PDF document text
    • https://incense888.com/uploads/files/202109090819112324.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/fcd3d2209e49df8199d3781184738f51/86456550888.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/12038323864.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea39670f77---dorukivakaxuzipemam.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/82698480906.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c004cdb2ae1166282d09bd8ee21fe032/71072469628.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea48426480---tuwatizani.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/13138306998.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/81892446076.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/zuferesizujuvapo.pdfIn PDF document text
    • http://synphabase.ch/upload/file/71921742679.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/temuvukixepu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/koxemanogo.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/91010771337.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/wuwilidemitatetu.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/92115243025.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210910_7426B353085A0CCA.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/8267680091.pdfIn PDF document text
    • http://pinxedien.net/upload/files/34366345392.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/33061578831.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/58522000303.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffde22a75---99214749336.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/86425680333.pdfIn PDF document text
    • https://fultoys.com/userfiles/12127385699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+mumu+appPDF 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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10152 bytes
SHA-256: 5faa59e27ce2daf5d1b74d4da8eaf701c1c34b983ec66110280782fba686219a
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 18132 bytes
SHA-256: 401207ec115c47c43432bcea8cadb5745f09def100c09c1773075bdf1afd2826
font_02_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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