Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d6e78f7d7e0fe4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 051745eec882eab4bdd410421a9d28ac SHA-1: 11faa26bad16a428de9cb42574bb242db58a1ad7 SHA-256: e3d6e78f7d7e0fe4598670e589b676b3afe0ade1886497a055f533e562efdff8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs pointing to various websites. Several of these URLs lead to compromised CMS upload directories or are hosted on disposable domains, suggesting an intent to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3116242dcf---sivixelaponewunesew.pdf In PDF document text
    • http://caythuocdangian.net/images/files/fipujavowulasomejeragu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/kfknbve2m3lm6nvvagvcdkn6dn/wosominukag.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/wulebarulumulafawijuxi.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/51973482096.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/39001345994.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mesosimajizasim.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/h630fhfmbcd486vbbl89th9410/kazanuperulomo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/54861249959.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2df3d29d9---lekipigu.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/jomazilejopedijuxiga.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195fe75367---27077020144.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837d8e598c0---birosapesusexirojilagebo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/purularid.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/86858116956.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/247a23b51802111b78e9364437fe74cd/kijawibozuvurutev.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/65912677984.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///24416021322.pdfIn PDF document text
    • https://netpage.info/userfiles/file/44746675460.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3dd21372---76532685435.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ab686ac5---gumivuxuvojez.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/xevubuketanifiwuw.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e8349387---wimaze.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc579096a0---74499918520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=halving+numbers+worksheet+eyfsPDF 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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 17872 bytes
SHA-256: 14e966400e9e15e8507dda8bfa7f6e4883468328401cb9fa140822ede5608a47
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11252 bytes
SHA-256: 6804a3d8e8077b95eb373622da04a477f892dfe590b8c79e252d533f8b1b19fb

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