Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a84375d1d40963…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 19:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c47cea135c35dd994c7a09a62ab25e61 SHA-1: 64a4b0b8bdb7495f1c21b7dce5279e2b19e82ab6 SHA-256: e2a84375d1d409635c43bdb09a737e4a74104e59d54cb6e8060589d46b0131ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://maxidmum.com/images/upload/fck/file/dogidelepapezab.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc4d50e6---tomiboj.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/xasesojelijebuwerug.pdfIn PDF document text
    • http://markone-tools.com/upload/files/68973084222.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wutiguwosoremezatiw.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/sikakaxe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1d1d40ec---mojipaluzideturi.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/zelowekiwuwes.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/62099636200.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/nowimekotefapixigutikiw.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/varuteda.pdfIn PDF document text
    • http://mgrima.com/files/file/73645084550.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/81441737525.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2b3da34e---83149750856.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/wiriwodale.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/77344117590.pdfIn PDF document text
    • http://aminotp.com/upload/files/79759413182.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/lirivaba.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/guzevajeba.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f87529b7---tubupupomutofipipilerebu.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/96904082698.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/mejosutelulelugapufuxafa.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/rezux.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/dufibavezapuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=note+program+for+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_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10604 bytes
SHA-256: f854a06acd8575ad6522647efbeae08548b217c6fbe728574723e121bc405c60
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 17880 bytes
SHA-256: 668150e4a84aa8327f25c9a58fa823d8fa7ad0ca00d0f853b866d7802548e7d1
font_02_sfnt_off000141b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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