Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfb7985dd870c66…

MALICIOUS

PDF

93.2 KB Created: 2021-09-01 08:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dc4540ab2ce5f4f30c725e1cb8924d1 SHA-1: d616ec19567cb536ef40fdcf2c34d1ab1ca4fe20 SHA-256: 7bfb7985dd870c662cc555f10beb085d59493115026cd382c76ec76f9ad83e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, specifically within the 'formcraft/file-upload' directory. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf3dda6531---98999028267.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd19b8189f---7875788510.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0278e0d785---83642501978.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57902875500.pdf
    • http://sunjewelsonline.com/userfiles/file/33256868680.pdf
    • http://rana-international.com/userfiles/files/kemigenebajife.pdf
    • http://marthomaiticherukole.com/userfiles/file/kavatepilitimesexe.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/57714526276.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100efddd2c4c---50591207115.pdf
    • https://alnahamgroup.com/userfiles/file/4167025096.pdf
    • https://cet.sk/res/file/sazifosajevakeguxep.pdf
    • https://havanic.com/cache/fck_files/file/19136531793.pdf
    • https://bmw-zona.ru/uploads/file/12691234181.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6gqupjk0j6et3van43gvog43gk/32005083334.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f432854491---vogoverujirez.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dojaporixabiro.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612a03658c8f3---80383896794.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f20b6c9a---lokuzijeli.pdf
    • https://holycrosshealthcare.com/userfiles/files/zetepijoma.pdf
    • http://rulife.ru/ckfinder/userfiles/files/tuxuwitapapemalidisonu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe05c24a217---28045829680.pdf
    • https://torgradio.ru/new/files/file/ziduzigulagimaloxigipaj.pdf
    • http://delta-serwis.pl/pliki/tixikafumakoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tld+top+level+domain
    • 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_off000105fe.bin
6104dbc84149e35d559473bcc919d7cf75c36506f46919822c1d1016cffb14d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 19232 bytes
font_01_sfnt_off00013893.bin
648d3a867f81b19435273fb521f7de24ebbdcc862600a48831d7bc95bfc2ae2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 10316 bytes
font_02_sfnt_off00014fc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC7 16792 bytes