Malicious PDF — malware analysis report

Static analysis result for SHA-256 665546156ac2612c…

MALICIOUS

PDF

82.0 KB Created: 2021-07-22 07:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daa71f59957d55fdc8f9414188eaaaf2 SHA-1: b3a08064546efab82a6e06b88fdebcaa5caf4450 SHA-256: 665546156ac2612cd70dfe5de6d5a2ce1541a59a3406f87befabf64c6c3411fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c4759580f4b9d2915c4166c99a412359/jeziguzedegajiw.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/flig246c9k0kopjn9m0c2okcl6/98324058053.pdf
    • http://aggengr.com/uploads/CMS/file/rumanavigav.pdf
    • http://akinmedikal.com/uploads/file/18679011226.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24fa0f883---76218194378.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e76bf3fc6---welonazonawomadu.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5862f813441edeb85eee7dfccb783930/94889115457.pdf
    • https://adtw1.com/ckfinder/userfiles/files/20397158709.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c123ed36a0a---wivigugarusoribakositug.pdf
    • http://tremonttemplemacon.com/clients/862779/File/fojimagesadebakuwipoxogam.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94cab0116---75925340280.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/64d416ca573644b89fc5bfead23293e3/21277477366.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cef3a9a1d---32035526085.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919f47bdf9c---52215920223.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/netajoq4okfhrc0eoceh3k4ap5/34974853843.pdf
    • http://clinicoral.com/img/userfiles/files/750216556.pdf
    • https://tonitomov.com/picture/file/39015368328.pdf
    • http://barrospizzadb.com/uploads/files/47862788906.pdf
    • http://hopkins1983.com/clients/861771/File/lidevilojawawatev.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/puruwenosazakelunedeb.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84eff282f---41456901833.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/6ff54a96c4e9c76dc4eb1d5e72a59154/59045468382.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3476d0b41f1146efcf6eb8d10ab9d41b/sazoluvaxuma.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what%27s+her+first+name
    • 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_off0000dbbc.bin
94f0389c51a78347c53728bfe613a6ed132da604bb0318d515ad0f9fcd4d340f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 17660 bytes
font_01_sfnt_off000108cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
font_02_sfnt_off000120e3.bin
f13cb628282adf067fe5049128d65ec38b8441605081fbdd6cbfa979b5978cae
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 10340 bytes