Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4890c34daf5701…

MALICIOUS

PDF

95.4 KB Created: 2021-08-05 13:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef0c17343012aa9c21a6f029b8e58002 SHA-1: fb16bfe8261ecd3b35a08369ea0bbfe3103d9a2f SHA-256: cf4890c34daf57017e3467d9db8d8ab12b91d60bef3ae470d4ff2bc4d52bdb64
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://garglob.ru/uplcv?utm_term=how+to+use+pivot+animator PDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/dakijuvero.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/85e27e283ea2198adde04ee66c3943eb/pavumegetiderolokidimale.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8bbb16be---vumivevikopisomilojot.pdfIn PDF document text
    • http://sivam.pl/files/file/45268076155.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/43582714383.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607de010d65ae---kudofa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160701c3e39cac---96382245768.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/dobotexubinakikopoj.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/tfq052sd01a95km844umvrnu27/76236583836.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd434ad5c9---15269675903.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/nafuranaf.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/93658806030.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/70949648150.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/027a5d90ae7bd1fe5748503af9114244/xikigugofojanigiba.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d0552264d---49699722809.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/da873fb9d09bd3aadd652d4a009daffc/nulizowapagelalosaxotiw.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0eecbb4b9a2e6ae9fe175caff48dffb5/midelusuf.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vosaxaxoxepava.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1611648a1---31651784695.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a0ifaatmetqnte4ntfeuefciel/doguvuboxagolezozuve.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5381d7d6---jadivanusuvemajegoparul.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c639fb038a0---xamukojepogalov.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/pubawozeg.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/p3hk2uc4khc2knu7jqio06bq54/tivik.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/temovobubumek.pdfIn PDF document text
    • 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_off00011394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 10612 bytes
SHA-256: 8a9da5b1448525bff3d73cacc1a743511931545adc3435acb07c91909fb7dbeb
font_02_sfnt_off000143f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F0 16704 bytes
SHA-256: 8b31f44dd063271a4bf1849f2a1ed1b6c22137c45b667532be93640b1ca919a0