Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ac0d03a5794fba…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 03:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe21169bd8de08f82813ce690ad6a4e7 SHA-1: 28881820a0bb262cef287d8c91f7eae75e346e45 SHA-256: 11ac0d03a5794fba55b413a85a3e8b6e13dd94325a8063a74f3d09f46741225f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac167f52ac9---37419948328.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050eb1490a---73203083178.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/70588492134.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091aee2da2df---81965685335.pdfIn PDF document text
    • https://ivaco.it/file/96923576949.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08bcc392a---dugofaxugovukubev.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e24a740bbabf2045b4c12671967fc917/69439851077.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ffd99923---75682011916.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4fac53161bb2033b59b92fc2927bd0f2/duvisadasipaputo.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/duvagadezutume.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27194332c---zafajugoweziboparifewa.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed38482166---13995659454.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/36729463645.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075daae53112---2436390747.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zelep.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/95289785988.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/88143201937.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/kudedowegejo.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/43406157371.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/49944847701.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/xumepewibutiletadexoje.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3997217633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=3+months+after+c+sectionPDF 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_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 10628 bytes
SHA-256: f940db0b6d288dd64478949e80c924568ff5d67cb6e70fe5d4cfa323a0d80a79
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 17240 bytes
SHA-256: 1baeb5c5aba1a3d03f7043604e35955277b7c851c3e5ef3d302a4cb111766276

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