Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fa1b875a562c17…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 02:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e413ab9e28d3215b8ff63aabfaee2551 SHA-1: fbb1a898ba70a64ae3dcbeafdd0ddf6ad12aefc8 SHA-256: 58fa1b875a562c17c71db5801caa203613b5f60b4e3b15b366094a6c8c14ff89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the nature of the detected malware indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42414ad3f---98071742011.pdf In PDF document text
    • http://chronocertif.com/userfiles/file/xawaxetakimubikirever.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44334137625.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab52136b7---wevupolizuwirisigapike.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/33kh9slj75iieo2jucil4kmm67/dodefurujidopofukilaben.pdfIn PDF document text
    • http://zuche0551.com/upload/file/47167408663.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6b10d15a---xaberuvipigisaze.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/35312652985.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jewozonujosa.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/64031634157.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/skn087ql15t33ft23stjsaa88m/rexoxuzumazikujafesed.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/47567125234.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lojaviwudiferamaxaduk.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jefekiwetowunovegenojura.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2dse77maroo4fk1v03jqls898i/febusizasawusafam.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160716e8047f3d---kefefokupowav.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c043bba27a---zopemawevu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/nofozegoda.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e70fd58119d669de13517759d9e49b4b/pareseromonuxixisoj.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fa73585e2b6cc36e9f93f82603afcb46/27049603996.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ee456179---77533868795.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d8d7eba84---refenigutotov.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0595eb3258---tipixejevedavebekakukop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=40+quarts+in+gallonsPDF 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 17484 bytes
SHA-256: a448158898b0af4e510a42e701b10365f2476ebed7d927ba627c333f8c4be414
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10500 bytes
SHA-256: 04ae55ce87e5eeaa69670346ed3d33b8819f6a93238446fb36203411c73ec6e7

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