Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fd8a63b92ed19a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 13:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 801a6eb50e22d4af816d519c1e661e40 SHA-1: 6f9d9734968042974f5e543b6fa1ab99b2a28f24 SHA-256: c4fd8a63b92ed19aebb75e892a0911abdcd05f245ecf86801dd127afc2efcec7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, pointing to multiple URLs hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://jeansresource.com/js/ckfinder/userfiles/files/49356753697.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5caeefbe133db1c9a56097e5eb53c298/xanafazex.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210906061907.pdfIn PDF document text
    • https://oferta.lt/i/File/76898572331.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3c00646fc98d14b63687fadc482a39a2/99823676698.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/82630896630.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/xewinokuxiwelelitamixa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c693a2b88---falijozebokoja.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/14873155179.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/naxotigegizuwat.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/364432074.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210909_003110.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161307953c6ed0---24927523758.pdfIn PDF document text
    • http://adurucui.com/ckfinder/files/63992081908.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/76137611001.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/6293590205.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/42569601782.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161301693dba00---83179075967.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/50271680207.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/39787742088.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///60032543360.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/jadirufukevojag.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nofisobofa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139211e4ed65.pdfIn PDF document text
    • http://methese.com/upload/files/nejejapumizi.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/babafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=il+miglior+navigatore+gratis+per+androidPDF 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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 17664 bytes
SHA-256: 8dcdd4d4b1f237092e35faef55e84a2867e2a65fd67400e0a0b10e837b0d7ffd
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 10752 bytes
SHA-256: 37d714ac66b826ed7c4bb7eb268cb98198c5cf86411c88bba8b1e777f1886cae
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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