Malicious PDF — malware analysis report

Static analysis result for SHA-256 6326826a215ac499…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 06:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd1fd3cda1f543a9b13d21e8c43d1e7c SHA-1: b53b5c251606dc166aad5e65190f9158781f2d6c SHA-256: 6326826a215ac499b1efad94cd32834cafabb0c3c9d503db4d4cd65dcddb1089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to lead users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded links are the primary indicators of malicious intent, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=time+management+construction+projects+pdf PDF link annotation
    • http://monkey-do.net/userfiles/file/35732183124.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19f5cbd4---18683715324.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/29471512441.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7c27bd72---bujujudad.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/99903249997.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e145d48dd3e---zekalepilusolipu.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/5505658097.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/a3pqnfbdm0hj03rqkre3nfh9f4/tagivekobateras.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/vabewiwilisuwoxizo.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/dojidufisoresixu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/525b227b2f98ca73c6ed853a15508111/33098366231.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa21e347e---fiboderarafujevila.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c128b32cd63---32866444481.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/guxomisumezib.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8cf5a9f4---warulopepej.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210702_012130.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/81458659003.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/39633aadcf4eeea87bb829c053255370/jigezepekikuxufij.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434bc5cbfb---3137912241.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/poliwimovozuzebadol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9695c9aa87---84724764757.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/36240794797.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4f98ec326f5344f80a23218673a0e86d/22000827730.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/womutawokipafe.pdfIn PDF document text
    • https://aspirans.com/files/file/xuned.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 11108 bytes
SHA-256: ca97e70261c403b9c54397163708976a2cd94c485a04bcc7129e5d8e615c6a91
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 16692 bytes
SHA-256: 68b8c0c91f684605fcf5ad420a7618d223a2c8ea8a9c693c1353cb9d07f8a2c9

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