Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b6fe88a56018b5…

MALICIOUS

PDF

97.2 KB Created: 2021-07-24 03:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff18339739c09dea0101a83ab35ec278 SHA-1: a076150a1c4b78e4d4c38fad0a0e34c6f2f189c3 SHA-256: 74b6fe88a56018b5c8332aee7a91d6c7e579abaec6c98f3830a05a86614d9651
164 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • 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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6a34f47---71779537274.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb70ec91d5---meluvugopapasiju.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/c3kacp45tbh9vbj31asnbh8ugt/sovivijiniluxede.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c4f726e5d343c28b5a18819963da4c93/fenamumerenatanap.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9a9f22394b40ce00f3f825b21a86ea8b/84931334351.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f758266d035d3605b0ae15729634d5f/pawamexefefuwe.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e0df7da025ca636bf4e1be0853cc5813/2452320641.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2eff31d560778056d654ed717ca525ff/desawuladelomodevipobidu.pdf
    • https://rajakedua.com/contents//files/83876991440.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/gimiduridiraxujunaxex.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53101d0c52---91825917504.pdf
    • http://imcborivali.org/userfiles/file/kusajumire.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/nekabawobudebevubaxut.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/rozojodamexovumirox.pdf
    • http://allnatureint.com/userfiles/file/62904854817.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c81095fda---91098327615.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c98933bd015---fikumidelise.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e193d5913c4961d2f36ce77edeac271c/33777148581.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d047d2f0---kalaka.pdf
    • http://thunderstar.cn/userfiles/file/20210513211459741960129.pdf
    • https://stalbeckers.nl/userfiles/image/file/somajuwoputimafeji.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5beec79d---bimaresekumegamokeb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=limitless+full+movie+download+in+dual+audio+480p
    • 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_off0000fdb8.bin
6f4720846a493cf42666dbbbf021d61358e248fbea429ab5b0c5c9581aec1822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 11176 bytes
font_01_sfnt_off000117eb.bin
b3c462f70becf758b74790427ce88f98d309c5d3d9f6c04c47214bd3253e6206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16920 bytes
font_02_sfnt_off0001306d.bin
430b6c0adf63cf916ef91cb97ef386e3ece7cfcab76331b13266bdbd41babf3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 17292 bytes
font_03_sfnt_off00015d9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9D 16792 bytes

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