Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d41402b1db4f23b…

MALICIOUS

PDF

91.5 KB Created: 2021-08-02 13:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feaf3810d50a89c799862d48b0146186 SHA-1: eaee3f7e2afbd4179f245152cfa615b7223728e0 SHA-256: 8d41402b1db4f23b340b205f7f4c6719b7b263e23d53cd3d1b8c52324348c33f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a phishing lure, indicated by the presence of a visual download button and numerous links pointing to external PDFs hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. While no scripts were directly extracted, the overall structure and URL patterns are consistent with a phishing campaign aiming to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2b42569f4cb3f774ab08e9277a408c29/7501758871.pdf
    • http://93564497.com/userfiles/90422896286.pdf
    • https://communeouchamps.fr/userfiles/file/pazuzumijizukefanukadevos.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d4aab3eb2---42528352716.pdf
    • https://gaziemirkentkonseyi.com/upload/files/47272740207.pdf
    • http://arniestribu.com/campannas/file/jifuraniket.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d69b9c1b4d9d4ace8e36e043350cfe9d/sisalanika.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/29867968142.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9353745f9---tinudatojuv.pdf
    • https://livredart.com/ckfinder/userfiles/files/bewutanepibumosorikuzi.pdf
    • https://la-klamm.org/Files/files/kufesunuxavesopiwid.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/leduxabomaloku.pdf
    • http://change4best.ru/upload/file/xozikifasizefavi.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acea671b1---kugefukadevupaxot.pdf
    • https://beldaoyun.com/calisma2/files/uploads/61733053273.pdf
    • http://silesiacapital.eu/data/file/53701528924.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/12h522216k7bkmn2s27b76s010/dijabejobabir.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5fd07569d08827cc92c35c121b75a3c9/davekedojiputebezujunugu.pdf
    • https://sportsht.com/userfiles/file/sotalonomudo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e24a919ba76---23902337870.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2bd9d74fe2db0cd20a39de20cb346ea9/10055758705.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd786502b71---80429247790.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c22d372c7---48737687793.pdf
    • http://studiocalcinoni.com/userfiles/files/7793219222.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf79af002e---rinawilefibigedudi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hack+sniper+3d+assassin+2021
    • 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_off0000eb6d.bin
bec9d2839e0e18c2689da11fa294634b45764877f5afdb63acb9f1972ac9164f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 10792 bytes
font_01_sfnt_off00010472.bin
721a025483a3197c33225120de971d30c91b7bb78b1f65c993cfe67ce18c9d23
pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 17088 bytes
font_02_sfnt_off00013086.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 16792 bytes
font_03_sfnt_off00014897.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x14897 16164 bytes