Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be4f99e7e33eed8…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 20:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c97f71426086674521368a069ab25249 SHA-1: 7df8e05604c57351db522827684f46ba84d34cdc SHA-256: 7be4f99e7e33eed8dba67606409edcf8885b4824699a9596f5a3a1c3b91e2e64
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7f22b1bc---winux.pdf
    • http://adamlegal.com/userfiles/file/matelobe.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc4961f4c---41984343783.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a476c43c85b---mifefeluxubasum.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/pexofo.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609410a76504b---libasewalovode.pdf
    • http://agcslohian.com/userfiles/file/98434771416.pdf
    • http://petukmahaaaraj.com/userfiles/file/15113187794.pdf
    • https://stcc-sa.com/motakamel/Ups/files/54084211875.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f0e31ff---fafibezevodajokesisudos.pdf
    • http://ampletrekking.com/userfiles/file/8122131138.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/u30a6vq5ov3uddpttqvogplsfl/6515851021.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/239caec6c1a9670d50d54c6b3e038e16/totafuwe.pdf
    • http://posekatzahradu.cz/files/file/gofatikijumuripewa.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/rijoxodusujagomorex.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/30eb842ccca11e39338f602a2f9996f3/ritokeladovipemiwexanude.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/74796736102.pdf
    • http://maility.pl/_ADRESuserfiles/file/50300631796.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d259fe6c035---62355685202.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/udvqnjcdhr8f5jrmkjhd13opcg/49120330068.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e85a36933---20443399382.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936900163---rupogawuxip.pdf
    • http://telekommarketing.com/firme_data/files/gotamegapububuvud.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/nogak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=braves+outfielders+1990%27s
    • 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_off0000ea8a.bin
a853d294c4ae440e2aa819759e5f1d0abcfac32b8946d92e6d283ffa9dd097e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 17440 bytes
font_01_sfnt_off00011817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 16792 bytes
font_02_sfnt_off0001302e.bin
aa06a1e5bbd373107341ccdd2a57f6018b63c894abb07df0f017a0b2da4c6e39
pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 10836 bytes