Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6a24a1949397d7…

MALICIOUS

PDF

106.8 KB Created: 2021-06-27 19:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a7fef1d586451c7e7e025dfc3694e91 SHA-1: 53e23aceaff0f1e787ccd3670b7ec8cb00f6c177 SHA-256: 3e6a24a1949397d712ab25f09340b7e8f4ffad78a647ff49a1745a9e1352b52b
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting, likely to facilitate the download of a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b70b787775ff7d59f998eba7a809b9d9/nisojosakarakuzesur.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tobakubivilawidupu.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cdeecb17b032dfbe3ce9015abf699b18/81233423245.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7e03c66a---pulobes.pdf
    • http://bycongroup.com/UserFiles/file/dukizumemedimimalafof.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f553b10149---luzeja.pdf
    • http://cathugo.de/res/wysiwyg/file/24563220974.pdf
    • http://royalrep.com/userfiles/files/sojaruni.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91207f334---meterolebufuto.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a021828b2---76931169306.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3a3a5fc3b---foxazulumijiluloj.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/mizeburimetan.pdf
    • https://aljazeerahdrilling.com/userfiles/files/nebimasobexamosu.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa716319f93ca62971b31e5f4c0b11e6/kexazikevawelosofega.pdf
    • https://altonika.pro/files/fck/file/rokapat.pdf
    • http://domeinbeverdonk.be/assets/files/file/popotokosezujobetid.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a793b03545d---wedezewipumomatemifepi.pdf
    • http://bilmatbasim.com/userfiles/file/44690930244.pdf
    • http://goodtraefarm.com/ckupload/files/84419060515.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/659a4d44c7c68f02cc6219749209ecb6/sapagijidi.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/26455865975.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4a4f9e8b52f74f8e21fd56938582882a/20990079311.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/d4vdid5avrb17pve456hofvo1g/ribedimof.pdf
    • http://say-international.eu/userfiles/file/90778623807.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1eb435394fba92bea4bf07ab42bcecaa/fabuf.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3db257500f---14637707298.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=physics+james+walker+5th+edition+pdf+free+download
    • 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_off0001200b.bin
405f3f2aad707eae761647a430987d817d7b689bfa5155e0a442c931f9495b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 18688 bytes
font_01_sfnt_off000151c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151C6 16792 bytes
font_02_sfnt_off000169d7.bin
db8f0e91ca92cb8e7665ded0c4392b3a647cf5819bf67f2ffa322693e7e621bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169D7 16904 bytes
font_03_sfnt_off00018210.bin
8db0c8be7459ed5ae0160015380c6354eef65329427750a0f9c7c5035cfb919f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18210 11440 bytes

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