Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd95bfca1a39b9f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 12:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5633b9c14a07d6be9f2d8e7cedcb73ea SHA-1: f2f5b376fed3a05b01b810920b806038051e1e58 SHA-256: 3bd95bfca1a39b9ffa8017ec07931a7ae5fd2f3c71210c0afa77efdd615be97e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://studiophotosfashion.it/userfiles/files/95276247408.pdf In PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/48508586713.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/59807566669.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa46641148f---joxorilunakomawuzi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f299b752ac2---78792073816.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/98611015898.pdfIn PDF document text
    • https://777mto.info/contents/files/4521729183.pdfIn PDF document text
    • http://lawngo.net/fckfiles/30063532647.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819609063---75633865139.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee2dd20cd---31738589576.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/132600703160a656f8d3fc8.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/7233587846.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/96545362660.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b787436545d---8146685039.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/11601973760.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/12655543034.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/833s0l0u7p3dou5uqcbjoaq7hk/mezukaxulorenelinukukil.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/wuwipuxojitanunemezi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/pifimuso.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/fopol.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/49c677c447fa670a485b9f5b1348df38/vuvolutisevavojefonowafam.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/borexotiwatalegajesuxova.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/59459648229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anti+hijacking+law+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_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10668 bytes
SHA-256: cd57a5b62a340c40500f06b60db4b5a684bd8bc7aceb1de4d4b6d71b23f73693
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 17488 bytes
SHA-256: 6ddbf179dffb8c0abd951911c744c3a6c68cd4e7f8e07f072aad668b95380bb4