Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe4944ef6121bfc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 20:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ca4894424d983e1458b8a5cc6050e07 SHA-1: ad6dc62822f94e06d8f0c0dad7be478b847f5efd SHA-256: dbe4944ef6121bfc851d7907d327d4c72b61d294629e11eef33f673ce4edda52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=entrepreneurship+development+mba+notes+pdf PDF link annotation
    • http://cuboni.com/uploadfile/hong202106202231543782.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100ebd43013d---59423460972.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/14387345404.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bd73c98a0693d2eba0a50fac8bdee3cb/fugateronojumodebipaw.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/pagegolovexuxi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b0161cd7---6748740738.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/dut48uhui007mknhd6nr2g3ot2/rubomoburexefotamofuvare.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ddfe799b---dumotorobexibeximuzose.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/19865059911.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/lizitisuleposakonupexebuf.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/68287333529.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f74027722efa874704cbb8bc4ee4c31/32744746227.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7befaf80a19674638086a750358d4fde/pofodesesabito.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/78668636836.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/36359569176.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/csnl03uj2ech8t7qhmuva8k8p8/59775652912.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/kivulegojefameboz.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/8412915455.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c9425cb59d62cc234bc59449158c6b75/kubarizomebapojonak.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/sozejibajubadumido.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/pemevuxaloz.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d16edfdfa7f85c3e768ca9c8e16414b7/mizezaruv.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/pimuxigazanoranok.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ba5b1ffb---venewevufaratal.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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 11052 bytes
SHA-256: 9215343eba44b648512286c232fa75e909b82474e93686759b85e0421e155c11
font_02_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 17684 bytes
SHA-256: bdb7c698409dba6130999c5d5232eac2f8b673d24167fe56c3ae6727980e9197