Malicious PDF — malware analysis report

Static analysis result for SHA-256 58eb61a109223854…

MALICIOUS

PDF

85.2 KB Created: 2021-10-05 03:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c22f8cdb85aa2a9176b7bcc7e7b992c7 SHA-1: 54857f712b5b49ba82753521d1a679afecc91fdb SHA-256: 58eb61a1092238543b5b81844a071673226b875f5cc1788095bd3119dc58a970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bige.vn/uploads/userfiles/file/judaline.pdf In PDF document text
    • http://novichiha.ru/pic/file/62252157108.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/39946452805.pdfIn PDF document text
    • https://rotitelor.com/contents/files/97736840463.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/45784800622.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/nasalowevarinotokuru.pdfIn PDF document text
    • https://hn-as.dk/sites/default/files/userfiles/file/23904396700.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c880a28b6bb8f77f13ce35f14de46201/4331884169.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/39386195539.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b09c5389b---19691689956.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/majomulimuxujof.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6cf784b3---koluvenegexe.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/fadojuvuzepuvepijolerunit.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/pebesojomef.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b80173680f---94171960837.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/mevajaze.pdfIn PDF document text
    • https://ghnservizi.com/file/23737492345.pdfIn PDF document text
    • https://datenglagi.com/contents/files/vosogosu.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/fizesirarimon.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kanowixolomenodejuwigeva.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/iri2ac5sb58ils93g5b4ih4snm/xofalerusipuwat.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/48578400991.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/17209671638.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/96417360117.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e905a627---79975000584.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/87758252077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+season+do+you+harvest+cornPDF 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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 10604 bytes
SHA-256: d810330fc110266787e1feca4fdc5b65fe7f7eaccc231b687553b88ef70ec1f1
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 18136 bytes
SHA-256: 97478f0c2cfe9eef9476d52eeb703d8ebf68a82c296811a9f1915e12dbccc606

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