Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a5b58e8d5236e1…

MALICIOUS

PDF

88.3 KB Created: 2021-07-12 22:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52486e66abf00e421ff69add23abe981 SHA-1: 66a1b8650828724f6fca76574e0e0c8fd4c1c10a SHA-256: 74a5b58e8d5236e14d3857214a5ad737b58a01b5431e1c206fff465e65bfb29b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to exploit users through these external links.

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://olterus.net/contents//files/figezoladosilivovotited.pdf In PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/21019080116.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ade8c3edf---11085141864.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/2f6eed2bf84120a9039d50f40e3d32be/19491580919.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/42092757453.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/75b15dad68a816415e90c2b6fab1cd89/pogipijapugepekupab.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/84291488629.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/wejiwanivugisozawakalise.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097dcb753631---34619253482.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/bovosizebubafox.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fqlcfa56dkpu1imtcc230igqh4/faxabuwukegubuwiluxusad.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7dea8d361---sidemojupe.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/87320337595.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160733eee6bbc4---3475948330.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf936a171---99855849449.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/558ea9887e237d54708fd649b406c547/mitonagiseme.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/2228653730.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/nutenawudotavisakakusasu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/737e51f91daf45a1108bb34c56341a69/govazadem.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab13168b196---wapenojiwaman.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/badopajadon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=surface+area+and+volume+answer+keyPDF 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_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 17240 bytes
SHA-256: a472fd540b5ed7e1b5d2e64486e67cb7e2228e402134a47fb3d79b50dfecb2e5
font_01_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 10980 bytes
SHA-256: 5e73e2ed165e19af907013cefc210895caaee4387a43c0e3e2beaca8a2b7deb3
font_02_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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