Malicious PDF — malware analysis report

Static analysis result for SHA-256 971e82458ac5b0e0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 05:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 456e9ac3a5632374416671adf9842a78 SHA-1: f0d843da3046d5df845cc83f080c397669a22fc4 SHA-256: 971e82458ac5b0e06e60f51e6ae069b2472c0e9234ab2626c75013e12c2fddff
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious hosts. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16127726286e7f---29264491952.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/qgrel75m3980o7n8jr1rm0tqvi/lujowif.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/vulefesigipunen.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/7a90b494cfbf8a335d17020525efb2e0/38523694177.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2efc8060---40969859962.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/lowapojebosapibuxaweb.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/folojejakolukovumuwu.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/rurumage.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/52849759340.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/57776627939.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/32091091260.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fbe47d1ee6791b70dadaaa8d16ac8dc9/37119984533.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/tovosonipogavuj.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ef52ea92d37ea83aa819a2129993de08/fomegifaxikovix.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/770af3682c479c03814938b8b525656d/3650496456.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/wanetukaki.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/7653351548.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f53e39c92---51214688802.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/zogimezopezedovigobojemu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/vumagedatomelezonolovufu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b96fbdb370c---36120274218.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/t16sjpurgl72baav8c0e9l5odp/80546135772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=non+traditional+security+threats+in+south+asia+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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 10908 bytes
SHA-256: c5bd0864acf5710b9f3efa721af43b767e94dd739ba42ca52fb961dafbbddf53
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 16692 bytes
SHA-256: 1e79c529a1d6a3d8561bfc6b7721532051e8d77ac4b39f7e229999c003a840a6

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