Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9efa416e251aefb…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 04:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea90abfb30669245e733a93b9c691a0f SHA-1: 3468e4a004aee7a0ab8094a64fa69cc52a09bcef SHA-256: e9efa416e251aefbebd9ceb509c1735be2bced0573d5bd6562824eca4c5ac77d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS upload directories, suggesting an attempt to obscure the true destination or leverage legitimate-looking infrastructure. The presence of these links and the overall structure strongly suggest an attack pattern aimed at redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yilip.net/userData/board/file/japozobobawetu.pdf In PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/xatunopazivipeno.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/zabikimuwukefipazukep.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/rasuvij.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/wutinoporifuduxeb.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/bumitajonivotufixines.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/74217208290.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a895b00e---44730613322.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf98493280---92895491726.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b23307a02b12c45203b09dbc7385fecd/35253855757.pdfIn PDF document text
    • http://terminsk.by/pics/files/51591688734.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/62253224610.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/24978179231.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/g0uk13kkhpk0dst98f8m2927nm/43559836190.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f70dbb4cd---81556050938.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c496a6ee6a---19898217424.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e81ce3325fdf28c8d5e2a3071358ffad/ziwopebow.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/fibatajug.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/5713492572.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/o8qbg05erl8ul81db4a9nbb7k4/tegasobozigeganabudeduvi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bfd6502a9---82182360479.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/26077859207.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608397ff71f36---zenum.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/53676484520.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/gijuwize.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aafb478262d83fd1a10c5d51682ca05b/wikavijasovupuxemimed.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/3199118540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=illustration+art+books+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_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 10640 bytes
SHA-256: 6e0238ecde6a44741f06faf5f0086f73357a438a7a82b4f7ed10e1fea1cb9981
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 18956 bytes
SHA-256: 3ceda57adb923a1935a9b75f0b3bf85037726c9bd26fd59b24f230fc5a8b9dff
font_02_sfnt_off00013c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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