Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf1bbc4d0ec4edb…

MALICIOUS

PDF

93.1 KB Created: 2021-07-27 06:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6295311cc0c30e799a68ad01cdbe39ca SHA-1: 50b5a7f060d3c555093361e1b33cc6bc79b5b65d SHA-256: edf1bbc4d0ec4edb00547568c2a088934318d084dbaf5efeb38d1aa30756400f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or trojan distribution attempt. The presence of a link farm suggests an effort to obscure the ultimate destination and potentially host multiple malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hav740u39dbeooouiv99hntish/tosidapudafoduviwo.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0664ce3a---nelixelepanadevadim.pdfIn PDF document text
    • http://garderoba.sk/images/_file/2655401762.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tb6l641j066gk4gqo5u0gflmp4/wiwemuvudofevu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809351b59c5---dosuvafabejepab.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bbdd1277---ruvasabekepomunok.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fawanunotupitifexotubip.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430042153213308.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a045d2ba42---gerudawivutiwu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/33414103247.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/12837381028.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736111589ca---82148976949.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/32ed3e5351f045da793503494cf0afb8/minalusof.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6b043a12d---vonokizuke.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4fca9d2c1---tarijipanududo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2332a5f2a8f103b86e8730ac30a11696/89346178379.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463fbe6d90---mirenulitazugosomiwabe.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wifenituburivo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/219a435a4cd30333cf0a4bcbfc5feedb/98460075371.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/wokomugalopaxifokow.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4369c96b51343f5e714fd966bf5d6651/gejukosajobub.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b419d06f45f---fuzidugezumujonije.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///libemamarepadonugow.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jvdf6rlad26ei222t3dr2u7809/60752464434.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db56b41192d---46815988963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=unconventional+success+david+swenson+download+freePDF 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_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 17256 bytes
SHA-256: 2d0fffa0ebd849db745865f68f9d1d45df20140ce4ede54f3ec95a23060c993a
font_01_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 10728 bytes
SHA-256: c526fafe2b1fbfe177102f8f0d715db302e8f46899d9d3ef9e1e20129b6f3d1b
font_02_sfnt_off00014dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1