Malicious PDF — malware analysis report

Static analysis result for SHA-256 d988df5d8ddcb388…

MALICIOUS

PDF

103.5 KB Created: 2021-07-02 06:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1c1d466b77e79178852eee2cf481c30 SHA-1: 71e79eaee93348d5a7195fa4dc36d66e93cb2f47 SHA-256: d988df5d8ddcb38853558ea8e2a6512179d6c7156364fab7de6b9a80a4c4eae3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://asthasupermarket.com/userfiles/file/zifopex.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bab7a6519a5f9282e6c646db4d4602c/mejinazaxutalolo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804eee1bbcb---mapaletajinosutoxopaluze.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/du9tsh67ktjttc35ok8bhi0ff9/gomavoridukiputevanuwivit.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd5372bb0a---judolobojakonogisi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4a1b7c348819bec8b2cd9847e6a3fbf/63339424838.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/23603729917.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce83026d6e---3918681859.pdfIn PDF document text
    • https://people11people.com/uploads/File/52328407511.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae643f8dabb---gawidewenelugekuxagadavi.pdfIn PDF document text
    • http://kelvista.lt/images/files/53252914516.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2917f1fe---18833061927.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/ruvuzuzokabinixe.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091d352a9328---bazeranadamujowifimutapuj.pdfIn PDF document text
    • https://chp-travel.ir/data/file/34937061494.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/tebud.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/31881347620.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/e1d8b356164bde7401ed64d4d0869265/fidabekugatevumejoriri.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/91227057822.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/gumuvujujalalex.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/98711623684.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/lefitanuvobafone.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de87328de08---foluwafenedariwenixube.pdfIn PDF document text
    • https://zulapin.com/calisma2/files/uploads/bisupagig.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16075a23a2b8c4---pusedewitizefofegon.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/51a8opmvu2kiqbdt77879guq1v/39437100730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+rise+and+fall+of+nations+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001310b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310B 18180 bytes
SHA-256: 8e3a4db8ee67e9fc692eb8bbbf765129b6206c3c559b48131623a9ad6051275d
font_01_sfnt_off00016066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001787d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1787D 10560 bytes
SHA-256: 5ff5c007edbc41a8d6bcac1393a3e46000550ba0a2dfd34f3bcb0d2be2e52f26