Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda128acbb4fdb34…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 22:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f52e7468c67a363552d2338b341240ed SHA-1: 69b1d67bbf587b1c090cf70200e120c077fbec65 SHA-256: eda128acbb4fdb34076988a3e0a7924841634fa5f63ba75e83ce09004c0645df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=magruder%27s+american+government+textbook+pdf+chapter+2 PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5cc8df5a---7443122661.pdfIn PDF document text
    • https://roc.mn/uploads/files/fixegoviporubal.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9768da2c4---fadonad.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/zebufarunira.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/23537611793.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wuwimijibakusujever.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/3586679942.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/16233386447.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/81498383311.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8a787429c---72270384382.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16114d2e205394---8625805042.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/20ff7c0f7146efdab134e6fb33a702bc/21977482267.pdfIn PDF document text
    • http://sns.hu/_user/file/kiwetigesukomunulujoxom.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c87cd2454c56b2d6fe1a6929bd122f67/vamaveratulajaros.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/vurekulujig.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/18372494377.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/935616171.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/gimekesiveko.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/kowuzolepufikapila.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/nanusazanujiga.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc466520923---3792163953.pdfIn PDF document text
    • http://gestmase.com/media/images/file/83939597194.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/54456351180.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/zilixebowolemojawigefuned.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 18544 bytes
SHA-256: f7061ac155637f07ae7acc0e245b4bcb142b0605e2c7a45be476b11947b01b6d
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 11668 bytes
SHA-256: d25b098732ccd5f21f082d17dd2d616f7d5f16a03a21b88f909c93f85ab89d1d
font_02_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1