Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac09a28f53d6a851…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 20:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2675deaf29d034b19d65ce634dfc53e SHA-1: 87350fe9290d2c3c15f834653c29021fa762757f SHA-256: ac09a28f53d6a851cc929a2cfbf1e20c13f4604e1089e32afd0b0b0d783e7fa9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to evade initial security checks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/45d129b403dc7f1a61864c8e7dc57004/87214481419.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/xelazibularizebixugutati.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/fetajefexaropasum.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/pipekekajipineboboxosufu.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/8992894215.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/35102674231.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/74261847233.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/viwivugunubifurodonoji.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/55024763091.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/fesagerijebiwol.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/kusafusisalig.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/98880163304.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ak0a9osgsdtt4bt77413h87ndc/xidozapisuxijomokejapo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7b7e2f02---xisiguvavatomuj.pdfIn PDF document text
    • http://gabortech.com/admin/file/wezowofinamajuwulumex.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/razulejudugumavagisogok.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c297f02bc46---zironi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/81f22fcd4cd221f41f8a742f8a05095a/gelod.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/pimalutinotoragejave.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6abb5cb2---72658372498.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vasafoditawezevugorukakal.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/logiz.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kasedovoloxofakojovasufi.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/75114331634.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d96756a54de---gexerafevubususod.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/27917532654.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160862e6867648---18033986030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=protect+pdf+with+password+macPDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 10820 bytes
SHA-256: 0a987a19dfc51c91db02ba438585a591f88efcebd88a75f1edf79447d2719996
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 18272 bytes
SHA-256: 39e19629ddd7b1ec66a2d7378030de76ce66bea998e479c76edfd46264ebb461

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