Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5c4073024030bb…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 05:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14d10da43fbd6dda0d5bb163adeee94d SHA-1: 1597de69ff86b2533885460adadb6195d91d10d0 SHA-256: 0b5c4073024030bb4bc8f9245dcd42eee3fac29fff282d43b1fb196583a5e1c6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=apk+mod+jurassic+world+the+game PDF link annotation
    • https://confetti-seasons.ru/upload/files/21823111704.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/xebawemozis.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/1238984638.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46526f203---58371199723.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/6785404748.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/jixak.pdfIn PDF document text
    • https://mauspro.net/upload/files/pakoxodivagefebu.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/xuzuvomavizos.pdfIn PDF document text
    • http://metall-press.ru/files/dujeluvawawo.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/22671012460.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tafeforuvovewamado.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lejimexuturotexesadiw.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/f1da7ftac8donukfjc6g21j075/65863728735.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/5227257338.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613080e743f62---sotitofekefuratabowiki.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/23776917726.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/35137676782.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/75208749130.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384ea3dfe8b---24543032479.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c4c48ff57d559bc20d190cb2ab89c268/46591974892.pdfIn PDF document text
    • http://ahknchem.com/upload/files/zorasit.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/xaranagewimutunar.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1077774721.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/83821628778.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/35097824412.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 11244 bytes
SHA-256: 33eff6109abeca2360b30ce8b3e7c47940c70e584da906886d059713c9b81b11
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 19080 bytes
SHA-256: 3b5b73a3b7b4b66e73e5572693a25482f277e6f8b055b190f86fd8eb007cc051