Malicious PDF — malware analysis report

Static analysis result for SHA-256 358f1bff97bb9106…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 12:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f387654d5665a5a5bd254a09a5d6161 SHA-1: b0ec39ab152bb4cfb82ede3fffcc32ffa98cd265 SHA-256: 358f1bff97bb910660d4ae98dcd634029fbac4c4ec1562bb41c188e1e7bcca71
156 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://drafthe.ru/uplcv?utm_term=compress+large+pdf+file+for+free
    • http://oasis-inwaste.asia/files/file/94377355912.pdf
    • http://daydreamspin.com/userfiles/file/18448323291.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e37b4918---rulat.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff7adb25a---51056310175.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0463244ab4983ed6633be9296779cb50/pamonezemapatuwajexa.pdf
    • https://puntoagricoltura.it/file/69495156730.pdf
    • http://anthonyvienna.com/sites/default/files/file/1780460925.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c85262cdbfa9120af96654c8df387f89/7800984060.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/97359815614.pdf
    • http://kcde.kr/userfiles/file/zonutiboviso.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda4612710---posigurewusix.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a19e645c4.pdf
    • https://escaletravel.com/userfiles/files/9566466550.pdf
    • http://iehyun.com/editorupload/file/sufigopivoni.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a042ec4f---zalowuxilunalufa.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d6fd03919b5---widijuzeravubuwulexev.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae523a4ab2e---gajologogewozimili.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a005494029c---gopifavida.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/jiruzobafevajolidolufem.pdf
    • https://amblamy.ee/upload/file/zedokodeburuwosuxesuna.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5dacb173---nivupamesusuzodogor.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/wujunul.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/putofogikebirovipekezo.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/89816727836.pdf
    • http://ducthoaudio.com/upload/files/kenoranusaso.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4ece8aeb---16469581662.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e412242ead---66312980453.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
font_01_sfnt_off000108dc.bin
b04648c3726ea094238119345a5b59f73d469bff655e5b622a416002aeb1fdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17692 bytes
font_02_sfnt_off0001377b.bin
90f88ff05f24c77818d37e70d393f90276e2609ed55529990200566f5f3fd22c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 10668 bytes
font_03_sfnt_off00014fa9.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA9 1636 bytes