Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c2f7970ee0cc99…

MALICIOUS

PDF

78.3 KB Created: 2021-07-20 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b706cd82480b3634432a429fc25b5cbb SHA-1: c25e87409397b330ef179735cae21456f6a19c7b SHA-256: 60c2f7970ee0cc9981b9ecf7c43949f7e5f7e00555c5ccc64b4dce4ec706a59c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload directories, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://eperon-kochersberg.com/img_db/15990637120.pdf In PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/89023238155.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2d536e4d3c85aa127c12583dc957aa41/rerixewolibu.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106231942517163.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8eg9rkronjp2cshdtlguojseus/39163176196.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb97368a5c---nigixoponafobavak.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4m0sl8rm6jna0f4abpchs4jnjl/dugakuloxukatonibe.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/nukojovodilililagirup.pdfIn PDF document text
    • http://isvpro.com/custom/files/somezakiwikakubodo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608541d3c834d---4265755665.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/tojuluze.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/vudikomisi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85d254f32---6341549955.pdfIn PDF document text
    • http://getvisa.ru/images/File/59096190279.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/kkjuq4gq8g8fqmsiltjio33731/katuwukomokuletug.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/50493873301.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/22002286702.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/27953374175.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/64388860540.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d3e4484ab---73016834904.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48897630804.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/dofinamerakete.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/runezedu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/metegalofolejadozanar.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/76652427831.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/47232564517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+road+not+taken+questions+and+answers+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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16840 bytes
SHA-256: 3fb03ebd0df955c69a703ef47c3ba17e73598a386f3abb2d729bad57a5e278e3
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 10936 bytes
SHA-256: 9eadf7f5e8cf96a354c8df03f0b54ea9fb5adbbfadd434b0fefbf390945e4d10
font_02_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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