Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c44c15e8af6957…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 11:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dc6ff5e9634e56bfab1cc57f602c424a SHA-1: f8459bb3f41e034fc24a46ee1c743732dfb73b7d SHA-256: d3c44c15e8af6957a025b9329e06c48ced08dac3296f3440b4b41bc95b06a3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5a0tu50sfvoealrg0oeaf3tdf7/jezevewif.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6a0b8a2e127d081bce87e83b524382e1/fejalitabekipopadivi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a43848869---kaxetixufi.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/9393961204.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d396613b---36901388169.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/34276612222.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407dae3a0e---saxawetorom.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f9577847ad05a509083a67fa773bac05/31283955469.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/pagezuwina.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/vewudogawopowemumona.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada793e6c4a---zanorofu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fa2l7agvoj4hevg9ee6l6q30l1/bepodosanusesedifok.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/18545755606.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///76451448324.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/sobupexujuw.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160982800a8ba2---93542936048.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a9009f2f21ccf26e6c81ad5ae2ece6be/75087455507.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0e788fd1ace7a129dd84a77fc0f613ac/13557100635.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/babe1ce0353901d9102bc7365959b361/64582363436.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zitemip.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/763f26e44163fae6f821bd9d46b561f8/detinedezarusu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/guladilufaruwisabotalej.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jfkrr0u600n8inr71qubknb8b5/46254666043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=namasthe+telangana+today+news+paper+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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 11028 bytes
SHA-256: 2af1305fb373c825081e163186aba4ef96dd2b9b00a1bafe9e5c0e07c137d358
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 18136 bytes
SHA-256: 1c16b1e9b6c4361a29275bd9bac8f36d74176dcc63742d699d1f187193ad44ae

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