Malicious PDF — malware analysis report

Static analysis result for SHA-256 11375bf783508008…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 01:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b25da8e178aaefb0debb33d2439edd0 SHA-1: f82d241de08f6ba6a7c9b0a292ff88a072cf22cb SHA-256: 11375bf783508008c70dfcb8d6929e8e1ca678c0c270598b5da301da7cf2f4f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=idiomatic+expression+worksheet+for+grade+7 PDF link annotation
    • http://minhledtran.com/luutru/files/66381667808.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/70693815525.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909ee0b7e78---34730055095.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///15456127515.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/lavawuxisuto.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/bofuvikovotoxagulafedev.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/59002182422.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef6661b---91495184271.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/51704778122.pdfIn PDF document text
    • https://temahr.hr/files/jujiruximo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0a51d0bomtoo15b959203uein0/wepurosaberuvemusexir.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/14350175816.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098990035a7f---12673328041.pdfIn PDF document text
    • http://royalgroup.at/tmp/87114197912.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bc15e9c7a---rudefeja.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vober.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0c8d6daf7ad34ca2790e605cdab5ad60/zobepofiwisaredurejore.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • http://cartopack.com/Images/file/98557945385.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f909114e---gajanipilakopu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/mozumozenexonululax.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/60108905261.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/mepolufi.pdfIn PDF document text
    • 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_off0000d1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 17632 bytes
SHA-256: aad949d1cf8fe1d091a7b6ab0c20f9c6b1d5b6170b9d07164f23edd86fa748df
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 11304 bytes
SHA-256: 6029c557eb8eb75035d1f0f61a0affdbb907564497fc8dacdb22a443ec33c81a
font_02_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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