Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6f5b4e23b4862b…

MALICIOUS

PDF

99.1 KB Created: 2021-07-20 12:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7005d447490a7e2ef332e07cd607da72 SHA-1: 5203f6b0ec17227331a95625097a3a461d4d3a00 SHA-256: 0b6f5b4e23b4862bc09caba7389c199dada53aa6e95fba01eac5c0e10292d9fd
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The PDF's structure indicates it functions as a link farm, directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d660afac9---50975203898.pdf In PDF document text
    • https://nibrasimansch.com/userfiles/files/pefuv.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jarafawobifenarum.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce70be2c47---mofuwewimasetinivofefa.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e9870e0b34e51268d8c98e054cddcef3/rusugudubip.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d2b1dabf1c79f6e5334ac50847946717/59196418328.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be0de6303---nefovenoxeragomakisudox.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/25261930021.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/87325083323.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e60499296377f33573e8063004ce6e2/47699870771.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/frju3evd8o4olbc6edirji1qoc/guwute.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ea4560ea---15743590123.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/43890674034.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fb12e2d463d03886ec58152585ca7cc8/duvujetalefipiguxitir.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/vipifejebuva.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuwopiseri.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lasenikiraxavomovanana.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/tomeragijapudejig.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3f70d7f8db77baf770ae78f97c38010c/41044904202.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/34247336396.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f4a0e9511dc384e174a23415a6ecd136/46116225093.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1ef51864---15979103867.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc8618432c---41528018859.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b7295557e1ba53d175596d05aa93ea93/musodeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=signs+to+break+upPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 10788 bytes
SHA-256: be76ce961c5c1c06754640a4bd517a38e0cfd9a2ba0baf3cba94913ceaab1955
font_01_sfnt_off00013795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13795 18140 bytes
SHA-256: c9db3c3cd751e54e7436cada19223851192de82ab47531b45dce3fb64ad09e13
font_02_sfnt_off00016729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1