Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7eab10f559d1555…

MALICIOUS

PDF

90.1 KB Created: 2021-07-24 18:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f30e7f6a83c62bafb2a2e97c48d9c1dc SHA-1: 09be5b0c3838022777a01c6c870a42eea0a04bd1 SHA-256: b7eab10f559d1555d079dee13ae8e6b7c3f62a77724174e09659d3cebb005991
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains. These links suggest the PDF is part of a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/g470n4o21jc6820rei9a04g7f1/92722472559.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3692a40ecf0e62e176d2c8261e1a0604/92119915520.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/mibaf.pdfIn PDF document text
    • http://amdind.com/userfiles/file/87019607301.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/50560469601.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/554609999.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/mefipifokugop.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/wupilomufamanigujex.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fa09bb3f---56624374447.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/30879005375.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce269c2db---xavasujur.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a386f280e8a---37814331002.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/78638600117.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1d97045573ff2b6ce4cee47a2d2da8c5/ralavog.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb40959c7---75632661911.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/fugoje.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/disebemeto.pdfIn PDF document text
    • http://goref.ru/files/file/witijisiw.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/68a5cb561ec99a0cd40ef220897d6acd/8061210937.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c852fc5d30---lureretomomeg.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/mubavojarewozojaxidugoje.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210724_0FC19838BD51AE45.pdfIn PDF document text
    • http://aurora-c.jp/files/files/20639196708.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/guzogajiz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f19b72ca0ab---zilexag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=supercars+enduro+drivers+2021PDF 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://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_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 17724 bytes
SHA-256: 38d83f7e84baed92e6f382528c9549fdc76cdbe2a5c0b66769817bced414d183
font_01_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 10900 bytes
SHA-256: 4ea325d62df71c808d55a7ef7ba8b83ad7b178a92524d91bf6016606e78bfc86
font_02_sfnt_off000145f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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