Malicious PDF — malware analysis report

Static analysis result for SHA-256 e158caf2fcade415…

MALICIOUS

PDF

129.7 KB Created: 2021-07-02 21:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e50468fdb9e3d078cda47c73f4a64dfd SHA-1: 5b8f3e4f3d499a7e733e6d5ce1853b8deb4e266c SHA-256: e158caf2fcade415c9db2f0d75ff2c3cc4d92c3350ee83c6b5b528992b0f2aa7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs further supports this, as they likely serve as lures or part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bacb79450e---78007234335.pdf In PDF document text
    • http://leaguengn.com/userfiles/file///kuxojoxivoribepiwa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a565fc16b4---gokobezitoresigonisezokox.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/68213185722.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b69c09e407523bcdd97faff53ddbb8a4/14633957028.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/19vhsracl06q5fl3jk7fm35hc7/bujamatabizudukubevobed.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/u1v119tqktn4k04371i0rmi3kl/67927713379.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/57378288765.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e85cf4818a050ff6528928f15b124f6a/kikojesoxufafegekexi.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/92954266231.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/xutorazazizejomifutide.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/xebofubosujere.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/32012083925.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b276b1da914---rilekojisajimelogafimenu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/60068941561.pdfIn PDF document text
    • http://tms-operation.com/upload/files/26013124539.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ad87e80e00333b28abf481e74bb0ea2e/fazebo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8458682---bivod.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pps3t0f9cbckrea3m3qc4rgusj/gomexebisarupuboniv.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/26a1ec3ed83d70aa4071cd52c3a1a208/52015774460.pdfIn PDF document text
    • https://langumeistras.lt/i/File/bawij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=professions+with+oPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/25c7417793800ef829ace4c7075bbc7e/bonipifofoz.pdfIn PDF document text
    • 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_off00019a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B24E 10188 bytes
SHA-256: 7e0a7e297be582fb6e8ce06e9d09c7a7e967a7326b307989ef9c84618559e41b
font_02_sfnt_off0001c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C923 19060 bytes
SHA-256: ef29fd3e2af536e9f8f56abeac4662e3fd99a88d8dbbd4173d7bf2f8d1f64055

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