Malicious PDF — malware analysis report

Static analysis result for SHA-256 761d14e553ecc2cf…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 00:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179f3ad575e07c19e648ab452d6c743a SHA-1: 673d73f6a9c9a22f7712959c8df4fa67b71f0ae3 SHA-256: 761d14e553ecc2cf5d4cb6dc876d8fe9877b8deb5e10965ad9e1935bb9f3bd6b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content or for SEO manipulation. The presence of multiple distinct hosts and a high number of links per host further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0f11e6a2---tagofisugeferugululona.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f716e9882e---80018685855.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7f8b7851---zuvenuzozaregirisezoru.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/baxokevijimibileluditurop.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/89024979367.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f0745b6a---54304830382.pdf
    • https://dodatnagarancija.com/userfiles/file/45517389351.pdf
    • http://asiadomainstore.com/userfiles/file/84908890570.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2ljc7qv2klrsiaqfpmlprq61rg/20619056083.pdf
    • http://www.kymkarajok.net/tiedostot/files/66609357247.pdf
    • http://bukharaatlanta.com/sites/default/files/file/75383670776.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24bf7ada05---74993040145.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1bdeb6437d25d7552a43b1d271682a79/57360428213.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe3563fa1---19658432723.pdf
    • https://bd-sokolovska.eu/userfiles/file/92642622212.pdf
    • http://ddmlife.com/ckupload/files/voxujonewegimekiwonev.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3426738180---10250793265.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3f2a63552c2c428fb884e6df075c2662/pufirus.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b22436ae---68718085008.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/52390345221.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8494b70f---xilukonematixejaso.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/deam45j71lhu4uils301oifr10/33913446896.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8b190aa6---kavupeburetagotuju.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vg59psf25prs2hml72qr54iott/5392383443.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/bukokuwasakiw.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/reniwubebanagavepa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+read+electron+configuration+on+periodic+table
    • 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_off0000e9af.bin
cc741a9a28f775dc23deef6bcd211d9bd570c26911bd63f04d52775f5d55cf77
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 10944 bytes
font_01_sfnt_off000102b1.bin
b17d6cdba41726891f751599a2c858817f21606401f02a38e4929bab6467cc5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16632 bytes
font_02_sfnt_off00012df4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 16792 bytes