Malicious PDF — malware analysis report

Static analysis result for SHA-256 7421575fba97c1dc…

MALICIOUS

PDF

101.1 KB Created: 2021-06-26 17:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4af4561f9e4074fb6842a3e8801c33fe SHA-1: 6adb68dc4e84007285bb4792cbad6d3d314e08b3 SHA-256: 7421575fba97c1dca79e86a5dcd921ba4e11b4b92dcfdd15626d6f2a0e453ef9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 https://allytemp.ru/uplcv?utm_term=in+peace+lies+havoc
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d488771ddc---66299397015.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800c2d2e9e1---vonitugigoloti.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/76cb738bab754f17c538db728db23a3a/68192074854.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/57419544333.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/60394be9117d27aa77c37b9aa6d26329/67221286757.pdf
    • https://marmarases.com/upload/ckfinder/files/46175114372.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8858472c---mojuv.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f89a2f810---dunusiw.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160704979a0e7d---sisoruwofigofevogeno.pdf
    • http://interwork.sk/userfiles/file/10428432725.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603e6cf8a9---fuvuposifakilijukavapa.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a980909d279---mumalulolufalarupitevew.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407a40198c---35918023759.pdf
    • https://artlabjo.com/userfiles/file/86322254470.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b4cf3d1826a1c9809c3a3d684398110d/towugikefopurazug.pdf
    • http://adria-ex.com/images/blog//file/wejowopusupavoguxeraxekul.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nbvu2g67vt3l28ieg30j821t11/topaxuxilemuxumigijo.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2938efb3d666c687b210d69b3e40b2f1/98593746775.pdf
    • http://serdceprirody.ru/userfiles/file/galer.pdf
    • http://armanetti.com/images/moxozimusijegixojipikeb.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7921b0881e15be9598465101244828dd/dobukaxotuwinifefu.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0978d9083e---kulijikixerimepugebalude.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2807d3debaa31e66a41c94058a7ce52c/13837950823.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29d88a1fa---xawevojijigujimebukamarej.pdf
    • https://liur-krd.ru/userfiles/file/6491703333.pdf
    • http://www.monts.sk/upload_images/file/nufob.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_off0001265e.bin
011422ff2cf1004273afbb46911d095f733570273b174ddd7df6f4eb1dce4994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 10292 bytes
font_01_sfnt_off00013d77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 16792 bytes
font_02_sfnt_off00015589.bin
27957ffde46c12f2d7cf5e420d0e81bf4646101dd4c6f9b323ca02a56a0957e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 19252 bytes

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