Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e1966106e5078d…

MALICIOUS

PDF

117.2 KB Created: 2021-06-30 04:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04e34bd8aab39835f709342d9aaa0f0a SHA-1: b8bd87566a2df5b9a93171d124d3249214322b7f SHA-256: 24e1966106e5078ddd7b79804e8e59f1e36e371c0ae234bafb2faa73833e844c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to external URLs hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript points to the T1059.007 (JavaScript) technique, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6e215a80---2977970248.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7a0c42f32a6110c2d8c583be971a4b74/60168144285.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17ee1641b---53960798719.pdf
    • https://svingenieria.cl/userfiles/file/lijozewav.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783040d0228---58951346247.pdf
    • http://jpind.pl/userfiles/file/46232846347.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729d3a1380e---59710195368.pdf
    • https://bnovum.hu/downloads/gokubibinotifisuwano.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/739d62858b58205f239075e0fbdc0c33/31819471436.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6c5ca4a7c437deb5397cfc336a77965f/39673650664.pdf
    • http://abogarestudio.com/userfiles/file/keravoserumivikukijibegux.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7b9896d1e24cab66b3dad607245e7f76/94232304845.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f0cf973af3a03b3037340fbae98c34b3/muvever.pdf
    • http://cathugo.de/res/wysiwyg/file/11227877870.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ad610h691d4jdiicr24pgkqqt7/rulosizutid.pdf
    • https://argumentua.com/i/file/vumawuluruwurakez.pdf
    • http://gaishachuukobuhin.com/js/upload/files/8452275532.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160750d774bb1a---7241596507.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608675d70e643---texar.pdf
    • https://lavaecucebrescia.it/file/regugaranuwideduxorukide.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f240b577e---98666472714.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1a0a744789e666769b0fbbfe712323b2/43128291308.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609846dded0ee---89520939521.pdf
    • http://magnachip.cn/userfiles/file/20210513091155.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0v80av20pkfh9tcuf61mad2k04/55709516946.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=good+moral+quotes+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c21.bin
e0af079d2800beea7cd22dfb5588aa4a7e64a712312a461e79710b17e7a513b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 10980 bytes
font_01_sfnt_off000164e5.bin
d3adaa93df72ef2fd84922e963c41a1d95d5332105d64271bea072462b463591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164E5 16256 bytes
font_02_sfnt_off00017ae2.bin
5aadb1cf39bef56db3de51764aa0d43a3e7d68b0ab89f63012f7a873f759f0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE2 20140 bytes
font_03_sfnt_off0001aeb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEB9 16792 bytes

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