Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd38d2dcacfbe43b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 12:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c610cf6f70ac69a266a6aea767b45d77 SHA-1: 19b024aa48884fa63ad341f7083873248d73b81d SHA-256: fd38d2dcacfbe43b8904876187422e45c343b261cbc5f36ae28e83f7a50d5e21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://tanriovermensucat.com/uploads/genel/files/75605092210.pdf In PDF document text
    • http://nmways.com/uploads/fckupload/file/woxiw.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e012ead599---84838025440.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/98143622210.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9394b2f7822c2616289d7654f8572c75/mezawavibonibipotanuled.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e3a215dffa8423eb4c29aefdf1620b6a/94327003170.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161412cd8eb4be---juloxiwejitagimuvelimino.pdfIn PDF document text
    • http://espokebar.com/uploads/files/97943046720.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/budemidawabinadizefokili.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/pejixiwowasaripewatawaso.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jijilof.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/6366440550.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/jotugugupexuxedeg.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/nunig.pdfIn PDF document text
    • http://farmina.ru/uploads/files/88825867285.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/fuletejirawuxosa.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/90273798426.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/13281514770.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/26406292940.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f898a7c42a---kirajubelatimejog.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/dukurirozituxaf.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/57857325608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+free+iptv+for+androidPDF 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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 19296 bytes
SHA-256: 6f6185027f18a853e39dab1a38f6f1ed44ec7cffbe6fd92b30a8b2b1f73f8ac1
font_01_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 10564 bytes
SHA-256: 5f8bad5f63b4b5e4844122528bb51b9bad4711be8659510c58a8ee453c86588b
font_02_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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