Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4d1a9a1992f0c0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 02:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 539e210dd8ba4ef452b66e6baaac9d83 SHA-1: d883df5ab770e1d89c718e4c7d27bdcc42b950e8 SHA-256: fe4d1a9a1992f0c050e03dcd68192d2890b373824b954265b2ebb2e6993b584b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/de9tu64o0j2bpkehrji2fbb9j4/47526514126.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/60336864904.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/21088576525.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/vazizepawuwoxolu.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/83689655046.pdfIn PDF document text
    • https://thehouseproduction.net/file/rejefuramal.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/kikevowovet.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/sebapupir.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2lu36k00gl9f07lahcm5ebu9h0/37960057748.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ludidaxuwekixukofatada.pdfIn PDF document text
    • http://mayjack.com/upload/files/jifumedamosumofujetidiko.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a752dfb24---92206448955.pdfIn PDF document text
    • http://usateatop.com/_upload/files/femanoxumu.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/kefetedajopowo.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/67736980451.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jagubikamajamobuvo.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wulewojabosupukutit.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/13042577346.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/31921350561.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/sutegunedifunomi.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/jerutuwugunifajejezozo.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109090455126883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+scan+2d+barcode+with+iphonePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/678699028.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 17560 bytes
SHA-256: 572d433e62b09294feb13c3090ebeef7d8e735dc867d7ba38f86805617f17778
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 10904 bytes
SHA-256: 0a31d7999181040bad77a7991c57517664ec08fb5afd1bbefa1a678b105d0bea
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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