Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8148110d10dc221…

MALICIOUS

PDF

151.1 KB Created: 2021-07-16 00:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3cfbf2c1b4bd4a9566ee72a9c1267e0 SHA-1: cf3da81e82c33ecbf0a30b92406a7cec03aeb82a SHA-256: b8148110d10dc221cf4f27038638453cd9c13d0a86480181946a174b453e0484
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 are hosted on disposable domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9303

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 http://nappsa.org/userfiles/file/volupefoxe.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd61b48a79---fotejogajegumubujewafuzum.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be93367b95---65572144404.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/gumepo.pdf
    • http://mashtalkandil.com/userfiles/file/wazibafuxudijobigolaxas.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160dbed1b8613f---miviradijafiw.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078413322c62---mawinevakotolidekokekotur.pdf
    • https://cakenepal.com/userfiles/file/dekapupufedenavemoxowomos.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8cf5b6296f192298e5d621fd3c51ffc/66921842409.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6380b648---kemadopipusa.pdf
    • https://muzeumkonstancina.pl/attachments/file/16230408586.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/db85424c28755ef12243f9f5b014acb1/datogivikolap.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/81488719705.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/255d81dab843894ee73fd012fc209b82/towenepeli.pdf
    • http://chinasoftcore.com/userfiles/file///70586257538.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/69f85efcb3a1b32df042d1c46c266f11/46118438514.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33379972cd---pevirunagiwe.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/612add6567c8925ef3153c99150cf9e6/75070445625.pdf
    • http://szao-spb.ru/images/news/file/jufoxulejewuxirok.pdf
    • http://www.victoriousintl.com/new/resource/files/75057608436.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e7a54ded7---fagoko.pdf
    • http://busankid.com/webfiles/board/file///pijevulafunerudujez.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210701_8C534B8C8DF63EDA.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df8335df65---tijepojenigigakexozejax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=you+look+amazing+just+the+way+you+are
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f391.bin
240009a6ded2fff920e9de6a9581d8552cbecc716f7f31885bf1a4ad9a5e2b1a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF391 90904 bytes
font_01_sfnt_off0001d79c.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D79C 16160 bytes
font_02_sfnt_off0001ed11.bin
1fab43266c724e9c86f78903b102111f8cc4fe67fae13aaf19613235b8bc7d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED11 17136 bytes
font_03_sfnt_off000219f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x219F0 16792 bytes
font_04_sfnt_off00023207.bin
5fa558b2f45dcb2821020258a3208b443dc9e58f7fb89013ba537f8baab66063
pdf-font-stream PDF embedded font (sfnt) at offset 0x23207 11120 bytes