Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6bdfc9e6e51ee1…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 05:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 021dd79c1bafa9deb112e6cddb19c11f SHA-1: 217bf605684f4bf4e149981cc99eae3d8faf6e1a SHA-256: 1c6bdfc9e6e51ee1b603e581176a6a994f6e90c894a933fed2ddb8fb22b70210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://loonbedrijfschimmel.nl/userfiles/files/zinikedoxajup.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416ad2faca---dozibuxopadufiparog.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/pasezowuzof.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/kolajiz.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/mubukive.pdfIn PDF document text
    • http://livestocktool.com/d/files/73065595388.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/parex.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/migew.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/rujokizikonutikudaba.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/87386096076.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/81271667758.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/vawuxominekopaxigokifov.pdfIn PDF document text
    • https://phm.vn/upload/files/riniwegisasakoto.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/fujerafalukalotubi.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/72515431841.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155aa13337a2---15123092528.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/gazilesulerideda.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/peturumijebubuwisewadufi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xovusunisosiper.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jivaliletipaxuwatexijuta.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/99364116139.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc68bb4189---57752187564.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/80824085172.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/76543823048.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/bewibej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=indoor+skating+near+mePDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 10588 bytes
SHA-256: c638f0236cbde84e9103159b5386bcf3ae0c3127d17ae89093e721c6e7fdb64e
font_02_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 17424 bytes
SHA-256: e19f7f716e426dd3427c43233f66ca9c10e2c43d8fa4fee71bf54da12ef999f9

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