Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf6536b1339d010…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 14:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4123b85474f35cbdecbc773c6fe974b5 SHA-1: 5133ca35b8b6ac0d8ba80948b8d99cdeda7a2dfb SHA-256: dcf6536b1339d010057a303476901b76f090726480d3570fd4a226c3ab5691de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or link farm attack. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to redirect the user to these malicious links, facilitating the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/3k43lilmo7s9k360f131gt0gj2/14128666399.pdf
    • http://marinda.ru/pics/images/file/sasiwevuludezajowof.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6gacjnrp63qj78qi5jbq6abhk5/xobowuzu.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/d52a80fc3da58362552516861bd21996/980250293.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/16064061410.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/wonifuzuwewupejifijepo.pdf
    • https://lesfeesdelhetre.fr/upload/files/bevobegoxugapifilu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58d30e05a---19860731199.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/045aaaa369f4afecda924fb116204549/40781751212.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083792925d---funovomuwejiwijama.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967ce9026ce---nolifosesej.pdf
    • http://tamker.hu/userfiles/file/90577055403.pdf
    • http://anchor-m.com/js/upload/files/gofumazitarezutatesuma.pdf
    • https://aduanaldelvalle.mx/userfiles/file/32002712531.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/01vn9hfn09q9kddeuolqlfm1lq/simekifatoxiboxupite.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9ad0a85d---nilumukikikavomibepajijuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=indian+classical+royalty+free+music
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes
font_01_sfnt_off00010646.bin
da565cee48af1f7781299a09a288a9263a1f346ac45bbcdcb2e1b41937643fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 10804 bytes
font_02_sfnt_off00011f30.bin
3dd0ec2440c82626169601a8969372f73ee5b8f4457da502fdbf454285559dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 16900 bytes

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