Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e37fc5b32a2dc02…

MALICIOUS

PDF

88.1 KB Created: 2021-08-20 01:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b6f097a0aca7d4f36e08696b48cd2a2 SHA-1: 085a0ad6d0dc09edc8ddbf67b2f8c047068e2ece SHA-256: 6e37fc5b32a2dc027b66f5c473503e200818accaae70fe74537393cdc4588eb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://catamma.ru/uplcv?utm_term=exercice+ce2+orthographe+son+s+z PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/62a451ed333168cc674f4652f8a25bc0/ninafalaxoweziwedivurew.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8b3edc63---23428691306.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/tejizibatire.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8f655372ad70d36806fe80cf6244f11b/33058388274.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/94506685092.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/wabujugujaraludejapo.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/dituzu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/12376370699.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/benidetovufe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf2ac2a66---23264167984.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/80834794083.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/14415163348.pdfIn PDF document text
    • https://dietacud.eu/upload/file/70052482623.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4tu49m0irsacnp857rnjqcac2o/rejurigesufavixupogiri.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/749e84c0b8a3a302505b667b896b0205/59148672517.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/79555265783.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/xanidafugikododag.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074723e5bc69---78291246123.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/96d527ad583cdd0d81dcd3a670d2dabb/72866577045.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0b396d2637b0a6d9c3a778dc0d263a1c/wimipakizofex.pdfIn PDF document text
    • http://e-district.org/userfiles/file/vuselobo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6orpsr2u67he0d3v4q3v24pmqf/mafalidilizujin.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/vemidisekixexiweboneno.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/167cd9979bb237549058639455a35bfc/48942122012.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/jevinariverejekaxolololar.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 18528 bytes
SHA-256: d8642e09c2e98fb59d584ab6cadbb96e1c8288e3a5eda566b460004f4c9504d8
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10872 bytes
SHA-256: cd6e3cf72efda2c94fd3ee40cc707aab32a6040ded34718ddd0eeb4c58b1fffb
font_03_sfnt_off000138d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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