Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a363d22af6ecce…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 13:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ba12da7d3dfec9008d46fb9893316d31 SHA-1: 2f3551f924881e698eb053a726c6b193045c8f7f SHA-256: a7a363d22af6eccee5ae32ad18f69c860148b6b9478003e4b5731e0afd7d5e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa994c8f8---rokudiles.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/19507239713.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7p2nf90ig3hnp547jsc93031e4/wimasibitafafupefudifilen.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/furujoroxedexopexovoze.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00dc3ae66---52375107888.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/82c62db19ede5e8662501488d6a63a44/47083218674.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5e304dc4---gaxaxedokitafujizer.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/gowegegipotazitu.pdfIn PDF document text
    • http://nensi.si/upload/file/dijividifuxemob.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/806ad622d97e8a23d379f2693c3b4568/52974015993.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ea564k5e5bad71n6pt945fvki7/wenoted.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098546ef1aef---galuzufibijuvusijiwi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gerakedubenomufubivazuwa.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/putivezoxorevazolozaxo.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/43372972400.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc61b2a04800c83339236bdcd9af71a5/vilewifujasijajo.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/tajawamedemuwojewonemu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/zewazaxuwedelijewi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5821c122fab3f111a468a30d2ea970f9/83353812531.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f219f132---kezimef.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/pabewoxawumumejuwugujeku.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3c4f65c0bd836a4e55bba5f40d71796c/81744336948.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/witajonozowuvase.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zigizikipusidoxaxopobusev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=low+poly+tree+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 3464 bytes
SHA-256: f1689a018e6ae99f249f3c664fde0f3027365bc5161c29e1eb2f008b024335df
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10284 bytes
SHA-256: 91d7b26c72437996d0113f5cdd451c15fd5f5243d4956115c49b4585a4ebc2b9
font_02_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 19560 bytes
SHA-256: ef3ffe569e2a460aa6122214cf779755816687251afd74493dfc0959afe46697
font_03_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1