Malicious PDF — malware analysis report

Static analysis result for SHA-256 192584471ea5f532…

MALICIOUS

PDF

82.3 KB Created: 2021-08-17 10:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 838f70d94d549a5c1b8c2e02190b4421 SHA-1: 35ff786d927fbb95b3c0b0a85d46d3a5430e3c50 SHA-256: 192584471ea5f5324bccb52a186c86c67f3472a163a14eb0af7cf3a9ffbbc677
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://terminal.hr/userfiles/file/numadu.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7cd0bdd09e6eb28adc39fceafa03ea3c/kamawukusutukofij.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/29356931700.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/pasanomaredalixujupesu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f22ecf026---divafajigitimazekibi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/97801309201.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3f9b0f4c---rajaguda.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2198d792e25585ba1b62e76362f97ca9/natejubemuxo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610080c2f239a---jupara.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbe268ea1---befizofetenipav.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/43196591970.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/fesowupoti.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/dugije.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7befd76d97---kesomober.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a789c11f---xowipowabu.pdfIn PDF document text
    • https://termofriz.rs//files/72171174804.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/lokewewujovazijufedofive.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sagebopiranodasavukepo.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/32369412581.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/lafanagifunixuzodudugawik.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f551c793690---50449590561.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/33591356110.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/tobutawe.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/48364278556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=simple+vote+of+thanks+for+guest+lecturePDF 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16680 bytes
SHA-256: bb8d56271ef47259d3cf528d0313144ad9f92ffffbfb299d015c63c01a334739
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 11260 bytes
SHA-256: 3333b1fd9c1a535f2875f2ce696478e2299ff3ac3b7e1b06de7ce8c8f549b8d2
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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