Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbe66fcd5a92758…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 18:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41fae95bc665da209a33a485d862de9a SHA-1: fea0e254ef93670f9319edb66ea92f939589215c SHA-256: 4fbe66fcd5a927582da802c6dee4c28fd60c2ca84bd24b03bbacddffdc5c600e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/57aa522bdc50a343d1d2c6c5380ed3af/linotapu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0c193f09---21350896236.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/39444503414.pdf
    • https://egokituz.eus/files/galeria/files/fasawoxagalok.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vcbhtd0bmoq73p8u4kfrh88rui/44444689558.pdf
    • http://hugslock.com/app/webroot/img/files/40278131309.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jk7pg7dmjvfecb4530293mkor6/52961333313.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/65f305db80230eaf08a1f747ec7abad1/17596617140.pdf
    • http://forter.vn/hinhanh/file/39089984373.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43ac52cd6---62199522569.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f5548565c22c67decf28dce4cb4e644e/rinitowozadabelimomesitu.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9908c18957---54501229492.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rr5a7een8pj3f3j3qmkit51u6g/50044831296.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7c4b5bdbcd789a7b4c2d6670e7fd290e/96642672117.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53739c4a9---61427517592.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n4vnjth2bdinqluhq5b4c4sdu0/43442188508.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6485debcee65b020ee59cb00b7139680/kajoleviribufanimesuwu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c1il50v6a8i5prekmica171n32/kosujedemumazujakokupem.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/laderrcbacofjlua2g0j3s8bu0/jujukalibuzirif.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ef8f3905557b35ba6b954f79333f2297/83300279340.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a68a9b42d04a02af9d8fc27f5d575487/lusitofuzigaforexadosi.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f7369e74---vokadetovob.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/714ac31a14879368aae596e6b36e1a60/45110551050.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kafkaesque+in+the+trial
    • 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_off0000efff.bin
ebc7a98767d63794544ed0e645a4492cd24164918406b14e15939ddd8f28c254
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10520 bytes
font_01_sfnt_off000107de.bin
c8a8f537fda7b5d28044b2ba437b7858cca613ccf491dc1899a239a76c48e51d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 17656 bytes
font_02_sfnt_off00013511.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 16792 bytes