Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fd52b9898a502c…

MALICIOUS

PDF

114.4 KB Created: 2021-07-17 07:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3aeef91f47cd808bad56db286b1575a9 SHA-1: 05df399d8b8e5205ba20cd32afa3f20ce4b3cb4f SHA-256: 24fd52b9898a502c08bc1115996fbf947be3af1a4f2f3b5b87dce5fc33fd157e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farms are indicative of a downloader or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc6b699b---jugezirelaj.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1fac038d16dccc3af200b0656e2d7d55/68195743328.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6ea6lelta8ab8sq3psa5ll9pa8/5192498181.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/pinupetiwosuwisipe.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d99bd653dac---18469059860.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/44f099e35e51bc8400304284371495a3/visaladamupe.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/fukakinatudizofevuv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607243d4aab79---mokolokumaxu.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/68275216124.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/deliwaloniwubob.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec1a4bc65---kugaparobaxozadepuriwaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb70f067c---kiwafamabolujuwazine.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2522894797cd4ab66fb46b3581740709/73033807845.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b0300cf23142cdc1775ea59b5bf7ae8e/86636465745.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/luvasonox.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/bd487c0df070cfa1e699a43931873810/88519666067.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c6tnjs8b6ipgojsspue57tia8a/60003472866.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/tuwokunepulotomezisedijep.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/zuwotosesogotulek.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/206a1df44a28d65b3599de1de880799c/dedum.pdfIn PDF document text
    • http://termocity.by/pics/files/fudotejawofe.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/su17uvq0ue9156gifs3p74ld7l/zotivepifag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=women+and+leadership+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_off00015d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D52 10660 bytes
SHA-256: 95e4b68b50b55dac2a182f49efbf5af865432d7a1e398c5beb529bd33c86a9d7
font_01_sfnt_off00017573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17573 17420 bytes
SHA-256: 5e76c9a0f6229c9dc4cf03fdded758da91756b9764942e79f7bba2d1ea785cf0
font_02_sfnt_off0001a2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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