Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c656505c332d95a…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 17:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58a72966ebb9ba34c308a2c831455bd9 SHA-1: 4f396389ec9fa8235332dfd9342c8bba7e30f7a3 SHA-256: 6c656505c332d95aae7b9d1b419c4fd2fe35882d691160227cdfc045abae46fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to host phishing content or further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3du2g5tqg2v0s3ood5rhr1tq6h/50490458291.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/16b98f7e94bd0c870b57476f1c7de40d/futusewisiwuvigis.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/rolimibozivoxa.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af68025792e---lipanobugatekokoroxisi.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3c8a71b66eea4fd171959a6c104e5ff4/tunoza.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59ad47c03---koxutojabulax.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/68c2a9b3f88e6f1600bcea0499b4ac6d/ponawo.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b13d6127---bisoxakodixebovidowiwela.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160730cc647c94---nidafadudusubi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f6e8a176---98537164809.pdf
    • http://nordicaluminium.ru/userfiles/file/13805580450.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c40fad99e---tokexijovajutakog.pdf
    • http://eksan-ltd.com/userfiles/file/91785638208.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26a072e48---73207110273.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8119deeeb5---73865143175.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/9ka8nsq94rql7rgs2k46jmr6q6/90017465325.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824a51bca5e---kuriwojovelositogarezadu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0c2ea210---27701472232.pdf
    • https://toromecanicorodeo.com/files/94733623482.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2541effb---fazakosusutimus.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/da2363f321a04171e39274af5b61d18a/39690577103.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af04ce5ab---89629671593.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6080ce1837fd33665703c12bd56c7733/xisusijipufalaxojepi.pdf
    • https://hagakure.by/upload/editor/files/33179405166.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607185f2c4783---dapevidujazefij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=first+second+third+person+pronouns
    • 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_off0000ea67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
font_01_sfnt_off00010279.bin
9b9e49466b3a1d57e046f5dd805a227c273c8867686c479798bfef3f78c77a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16668 bytes
font_02_sfnt_off00012dd8.bin
3a84ec204474eb3e5b6d5523592d14b3538f84488a8326995e750326a271d2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 10480 bytes

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