Malicious PDF — malware analysis report

Static analysis result for SHA-256 7914814816730a4b…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 17:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a70db00fbd12982146f00152dc871b4 SHA-1: 19ffa93a75f0c4f89775594962f4d3062ade740f SHA-256: 7914814816730a4bbeaa66ff0c8e39e5d539d1b2aceb6da20435896bfef16dc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c1d6b4ae---95379826046.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/03dqgclb1u7j5cgrvjrli5eae5/1836633513.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/67788613964.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd988eb12---tuwelora.pdf
    • https://netshopnepal.com/userfiles/file/jorekapukolikame.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04b20219e---44039684031.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/06be20a9043201ef457cc17e4f069d63/82389529694.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2091b654---zijab.pdf
    • http://thepnguyentran.vn/media/ftp/file/54641684645.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/vl8bh01jpf0ccfi8gpckfb3bh2/mitovelinojefez.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bdf5091d---nuluvutud.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/17993576606.pdf
    • https://ncsccalgary.com/userfiles/files/32236687311.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fca5c1b00b83c56c971b041982c6bc30/81508598208.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf00e2d1c90---tireduliwojitagosivigi.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/4dce2a8b5d1d3774e1b357bc2fe80c92/levaluwikomafitufokuzeba.pdf
    • http://aite-materials.com/upfiles/file/87260530442.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fe8be806---63767536790.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/76fbc9a159603d0e8a7ed0e832863fd6/jomozobasixezesiki.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/71602450942.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1e2bae80---wumaruxi.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c02b13140---35278768505.pdf
    • http://www.yoko-ono.be/images/userfiles/file/28033904204.pdf
    • https://briljant-maleri.se/UserFiles/files/59683245928.pdf
    • https://smilepaper.tw/archive/upload/files/67413601745.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grace+a+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9a.bin
d1d69eba3db0dec03a80e00219f4c2537fee9b7bb2a239ff99734e52a11b3da0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10328 bytes
font_01_sfnt_off000106c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
font_02_sfnt_off00011eda.bin
5acecc8c640924851c01823237a3e1906ca7f50d5557f1b8eb83070cc9b736f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 17192 bytes