Malicious PDF — malware analysis report

Static analysis result for SHA-256 482bd5b51438eecd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 07:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69ed2fbc171442dfbd90ba8756bf2355 SHA-1: 131635231e2e2f881577e2d393d453a8000b94d5 SHA-256: 482bd5b51438eecde3c8ab7d67e8ce11e91bee3dd4e64cc4c198b56c2ef72f8f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves luring users to external sites via these links.

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://zlatartopalovic.rs//files/rupitasofegifakilemojo.pdf In PDF document text
    • http://kag.fr/userfiles/file/xekosodimararegulofamava.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b97bc8e4a08f140d1ff20d0a1bd7f5a3/majuwisegok.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zatesilirakiv.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/43684865314.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/zirewivijitasug.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/gunulan.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zijudebevopopoxogud.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf6c82800---wemorejanego.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/muxegikoxinerezodanimi.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/nebazasiwizumezelaxekeva.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/378434969.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/66408049547.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/menukifopiriteniluder.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160832b7e4a9e7---34946237859.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c438fe4b152---borevopere.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0a95bd443588bdf92d9492154380c2a6/bukuli.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/sojavibarulemavozufamex.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/29500760591.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/fimitetuga.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4dd2b2b9---21190332861.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/migaserojevewelejujare.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/desixuboseju.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e988a336a---7802547880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=experiential+marketing+proposal+pdfPDF 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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 11016 bytes
SHA-256: a9e56fae3e1683a568b65439025388661f845dfdf0a7cdf1a4e5118e94fbaf66
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16888 bytes
SHA-256: d5dd613548dd838c0e01a38190b95cb94e6873cc77912f978e5c4e72124f8070
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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