Malicious PDF — malware analysis report

Static analysis result for SHA-256 670fee85ab683fcf…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 14:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32354fa0f1cbd31ccaa4fb7b94877a47 SHA-1: dd5f62ba1b69f38e6a0c2c6b39b862e7ff53030c SHA-256: 670fee85ab683fcf5e10c4025ae2b9361a82a225c586c1ef1778c18f35faa645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/21459642502.pdf
    • https://diedacorporation.net/freesiafiles/file/2489111249.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bd07cc0a8ae98b633759b87454e53481/bepekotefoxivofivokanibex.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c65944233---59537347672.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fujuno.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfee35744---28873388098.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k7bfvakgsci9l4jl2n68s62ed7/nawekebasegep.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e9d347de6efdaa7f505f4be929f6d60/53713176669.pdf
    • https://atcotourismtravel.com/userfiles/file/nojebanosukaw.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e73314d76d65364b8bd32b96869083e0/fejefopuz.pdf
    • http://www.niziointerior.pl/upload/file/11999381236.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0c616ffc27d8a00f41aeaa8899fdb3ce/35531734098.pdf
    • http://happyhanool.com/ckupload/files/jafemujufubo.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab14d61174f---kanobisesi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c335e095dcf---22965217724.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c6ecf3c2806d5229468d108cfbbcdab3/83469527548.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0ngp86bihjua5kkk8uvrk6dm31/70640126736.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+meaning+of+engaged
    • 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_off0000ebb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 16792 bytes
font_01_sfnt_off000103c3.bin
6323174bebccb023472d8899a5649e830c4cbfcadff2491115571026bb6610eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 17304 bytes
font_02_sfnt_off0001301f.bin
29da464b689ef5973d96b2e0bcc803ecebde2573017d5b61fc53e9db491bf705
pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 10352 bytes