Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa25ddd6ee028e1c…

MALICIOUS

PDF

102.8 KB Created: 2021-07-31 10:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 535bd0a489e5f33803e0288e04129159 SHA-1: fd490327faf1c105b2237fac9ee23565e51fdd3e SHA-256: fa25ddd6ee028e1c3d3cbcc313f2731ac2a6f28700b494fdc7fe09146402b6c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of links pointing to external resources. Several heuristics indicate these links are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a downloader or redirector for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/2rqhftrju3mlfvkdgrqptjmlve/momalijobuwudederuxeti.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fivsf9gj889h9ipdbch4k0dhqo/81378058057.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39a919923a---luninevozezozipope.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b87fc9d89eb411daf7bdc86fe67d3006/nilugep.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6c6e3f82---xotenazajiwimikokowukik.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/81709256891.pdfIn PDF document text
    • https://combrooncom.com/contents//files/vasilidas.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073eeb04d376---21496246469.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/1889744137.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/fadezule.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/jepadakuruvekewe.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/t77ri96ch2icaqvc8pln67odk2/xubavijubibelunolinu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hp1scackt7n7aaidp3pf1ulqj0/paxuwamekejabifemuvaweki.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/nadofuna.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f79f1ca26---41037745011.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/gozelejosirawazikaz.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/63354454322.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e30ab740edade59f8b067c827d564b49/92421939684.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6f6b0d0cead3b38a50d5cd826308e34b/57616083357.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xirelogikudovidexel.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6u620h7s6152gdkhkuo2d2dp9l/wifimeroz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c514cb3cf7---23900510916.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/bozefevelobifumive.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/34182901727.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160856cc8c4bbb---56746937652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ne+me+quitte+pas+paroles+en+anglaisPDF 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_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 21824 bytes
SHA-256: f0086f9cfef1e08fd616bc5e601db39df99a05aea8ed1aa69e72367f748400f6
font_01_sfnt_off00015cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC0 10816 bytes
SHA-256: 4ba88d2ac28e44beb0d67a71712110ec3e97daea3564dde0e5316fb1f04ce177
font_02_sfnt_off00017559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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