Malicious PDF — malware analysis report

Static analysis result for SHA-256 4572e7c367f78c39…

MALICIOUS

PDF

77.4 KB Created: 2021-07-01 16:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de06319f08bfab1356ad6cd6aa9895e6 SHA-1: 17f2083b2e8a8049e4cb0e4d8c076ac2e77fcbeb SHA-256: 4572e7c367f78c3998c63fab9d62070b66642c594fe7768dee2a2655c48acaf0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qmsetetg4dv7h79ldebodatcq5/jozotut.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3fddd2187f893141a1a0d1d8fa1d4d11/62163144164.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9aa553b583d4efdb4ac122d8092eadec/92989713436.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vacu825venr9gb9g2ivs56ucr2/67529595507.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160baf96382af0---97392556039.pdf
    • https://go2germany.ru/files/file/76531522644.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b75599bce---tefufegew.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kezixamotabudelenizatufa.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4761a9459---doradetufogajukuxasogodin.pdf
    • http://kayapaliinsaat.net/file/28411885810.pdf
    • http://aven.su/userfiles/file/16164379307.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/14111d6d53834597debec0a90cfd2888/zimofifagep.pdf
    • http://impex-italia.it/userfiles/files/32191998999.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b2795fd5---81583896160.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf8c5ee88---13381802290.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/gujibebovi.pdf
    • http://axiomestates.com/userfiles/file/60001841660.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e902882aa---sewozudewewofegipib.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c91d5562182---71392425383.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076006c62fe6---nodurejotezitapa.pdf
    • http://elsekmont.eu/userfiles/file/33542864374.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5fae1a7a---laronufegopanudujuji.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b017d019---42251885058.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/57859402524.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2t871mranneq8u97518cb9m28k/88791331283.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=directions+to+branson+missouri+from+my+location
    • 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_off0000cb07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 16792 bytes
font_01_sfnt_off0000e31e.bin
9907b7f64ab2d20ea251a8fbaefaa030157b99f548d6ae2fbcf018272af70d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10852 bytes
font_02_sfnt_off0000fc3f.bin
39e339d9be5f46054a61ea8e4cfc5402430c75a3d36944c20526dcc29a146947
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 16788 bytes