Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5256ebcc5706de3…

MALICIOUS

PDF

91.7 KB Created: 2021-07-19 15:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8ac0f13feae8b4757d55e7c25de0334 SHA-1: 52a4584dba97a43e4d772bcc0a6291f5f24fede9 SHA-256: a5256ebcc5706de32b0419eaafc6e4a2bdd514010019c68120a2a4425f573422
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f80c2b39---48988501469.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/t7tu34kukqu69u4rq1psk9c1j6/sowiwaxibapi.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/teserikoximokatozodu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee93f8fa3c---20845128452.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kifenani.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/627503dc21ab699b814b42a893fa5d86/39754476821.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zoraka.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/mujipoxuw.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/negujobegazevafuligiwojib.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3a3add86---33814582358.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jepus.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/tasigotiw.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nilesajalozujixalojaxo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81234d0c5---mesagolujigudejupapegamis.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/mibugib.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/ruwubuwaremirodawisiw.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/69633517469.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/t903c7cetd3jlrm0r02lq0fr94/52509874370.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sazaxafawenafosatomis.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2ed0a285---57418216102.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/99073823952.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b02881dd---18507417362.pdfIn PDF document text
    • http://xycrusher.com/d/files/9477251362.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79f4270cc---dazorobakixarosuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=making+kale+chips+in+the+ovenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10704 bytes
SHA-256: bc9305b82e52eec814b92cf743af1df0706362840b33724fa9469a9302c46546
font_02_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 17540 bytes
SHA-256: 10f3bfa0874b6e7658170b010f59a9696ac9ef98453eb74c070c34a61ea9d775
font_03_sfnt_off000148e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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