Malicious PDF — malware analysis report

Static analysis result for SHA-256 280e1193c2648b70…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e70a4bbc3ecf1d47287933ae95f414ec SHA-1: 4118fd6f4dba82c838ddb40b955f711bd929c0a4 SHA-256: 280e1193c2648b7075a8857732af2b44c3809cd0108e6eea3fae5d4d945254b6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on disposable domains, with multiple URLs pointing to compromised CMS uploads and other unknown sites. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4da5eace4f9040e2fd84b4bd88b02721/5276374454.pdf In PDF document text
    • https://bawwabatrizq.com/userfiles/file/16088170636.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sefunokusenasid.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/wuvogufedex.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/sajalororugidupelilivat.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/xudok.pdfIn PDF document text
    • http://heureka-cz.eu/files/bivejedevusadavajula.pdfIn PDF document text
    • https://olterus.net/contents//files/javasakegi.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/tewenamugikagupij.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7d4255e6---82117937858.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ebq7uepv7svhb3f17c1lpph322/buwapalumerixupazosanutu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d02d4a29463---taxuganigopunog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f1ae3ik5aja0cfh37jgvoqvuc6/fijixutu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7475516fc2---venesatokadidemegopumur.pdfIn PDF document text
    • https://kenadong.com/contents//files/zipix.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/9750050030.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/mitaxiniwopilitikefu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099709b264be---99232805738.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/72763870774.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/61669239645.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e9e0d11172f5c166358caa21c03402ad/61817225192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=perbedaan+tanaman+c3+c4+cam+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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10748 bytes
SHA-256: 90a28140710871adbd56e3f5cb9b029ed9ff03f2f7d11b388ab0b533af9bc73d
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 18124 bytes
SHA-256: 83965418a6b02ef959d89ea9c3f3ced913ae95c3f27ff1ab0932e45672960941
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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