Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6168d4ebc4a1c4a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 15:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b074666f88d86fd8b59eb4fec56fb3f6 SHA-1: 8a02ae7480509d10162108c4c880e31c9f34dc4d SHA-256: d6168d4ebc4a1c4a26d188d85e2be29131ecbb1e77694d15ddc184e1820ad8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b3c0fc4f---lukedugudenotazivegatiri.pdf
    • http://guojingmall.com/userfiles/file///gerali.pdf
    • http://ballmillfactory.com/d/files/87475267602.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210809_C541658E420EC461.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0ca834f5cd482b663ef3821a603129e1/32614674240.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2108020510027921370wbsf.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.pdf
    • http://manilag.com/FileData/ckfinder/files/20210903_58F32AF5D8F58CA4.pdf
    • https://nepalonetours.com/userfiles/files/xekor.pdf
    • http://shqinze.net/admin/upimg/file///kibulavotolopusibufogunut.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b014179669---patujukativipareda.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eda2357dd7f---xuremufapenunojunidinod.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/698e586ab911d9516650df352b0ceeb6/mezosi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160716d24cb451---jobitogi.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/60359068638.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee518ee15---forudapopokasafex.pdf
    • http://islandpointfl.com/userimages/mobasopu.pdf
    • https://egyiksem.hu/uploads/file/zerotusemikirulajapudigex.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/jegojisasowila.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/62tbv5df4qdns4jhptai555fud/43013810383.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f428b5e6e8---miwisatabano.pdf
    • http://vce34.ru/attachments/file/mepupofedavuwafipetobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cbs+fantasy+football+cheat+sheet+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 16792 bytes
font_01_sfnt_off00010935.bin
3bc53dadb62a9700597753620e9db0f59d2eb122339f533a4a29d7c8b0025b70
pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10808 bytes
font_02_sfnt_off000121f0.bin
44976d6a0f97a1a0dd76f28f5c681dc9b0de3b3646cc2c500977da5f2908c738
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 17900 bytes