Malicious PDF — malware analysis report

Static analysis result for SHA-256 820e5560f704f42e…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 20:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e6f18f40bfd295e2102eaaa6c4925a3 SHA-1: 2238440982dbbf2e9692f47e3304e15b8e543406 SHA-256: 820e5560f704f42ea62adeacf62ab0bf6a17ef29f4ddab4a7cafd5ea664f368f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160799bac779c1---jorobomok.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u1tdsu6s4lgsqestq0m2nbhpqn/dabulaboni.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/50f22f5e58bf11ae96e846cce1238f1d/2291632537.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c5e64cf2---49882797516.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5f4c14484fe3349126ebe32a26ac3bcb/tufejaripiba.pdfIn PDF document text
    • http://alkanboya.com/files/file///kiwedu.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/22928234589.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4d10e1efba11ab65c3228587b9c7a3e7/fisosemowogoxunufe.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/42184609360.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/90587996924.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/52440731629.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/pimanujugasexoxamudogufa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bff82ad64---fabud.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb578f49b5a---maliwubigusomixevanuw.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/gubovopeleker.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/bosodarokebanimefujudupo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jefewiwojakofidukiwum.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/motonotenolokagexejuta.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/97958461800.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a69c8c0c---52314462696.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a472f34f4d8---roparexoxe.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/soneridotisedesojonuf.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/39858846472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=meaning+of+education+according+to+swami+vivekanandaPDF 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 16996 bytes
SHA-256: 396b9bae2f3448779ce96f83f7890adda47a460ab1f895b35a4c13ddd1f4eb6f
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 11112 bytes
SHA-256: a5dc6749573ea42c00dedd0644e223473d5847423c0887873d96cd48043efd20

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