Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b9877af1586913…

MALICIOUS

PDF

80.1 KB Created: 2021-07-26 04:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0fbaf40d7ade5b8a6ba9107d98d120e4 SHA-1: caa11d2b95cccdeb2e8dc23cfe60cd1ed81d2118 SHA-256: 50b9877af1586913c6f94d15378c972e6cdf53abb8f681d44d40b1fe5d4b267a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm for distributing malicious content. The presence of a 'download button' heuristic and a high ML classifier score further supports a malicious intent. Although no scripts were directly extracted, the PDF structure and link farm suggest it's designed to trick users into downloading further malware, likely via a client-side exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cristalensi.com/public/File/52905387524.pdf In PDF document text
    • https://nmcs.ca/userfiles/files/83815613311.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/befug.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/57b422a9b70f7fcf5306f07420afbdc0/wagib.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/52433000427.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8efb5ae080170537d8902c15fd3a21e3/pijorixomabonunawer.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23bbbedf6---45732222861.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/99012250947.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/72267982301.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/21311020469.pdfIn PDF document text
    • http://sns.hu/_user/file/jazakutadofusu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667ed0baee---59366724027.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k1l0u31k5emnrhhgcfpr9j2tl0/67965828270.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e68ab259---vikomanoruzitumewifete.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/31058595022.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e13ceb5391bd1da6d682c0d12b61d8f8/gobasegew.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8a0efd8a---96524824749.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/bumosibagufugusaxoti.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/039f0754e64e1ae2e0672d1c262ce8a6/pixobeburig.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/rufomikurinumupafekilaxe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a587d12fdeb---gawozazatirojesafenas.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/36201437416.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/dupufenamuxijevidelaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=original+3d+crystal+puzzle+black+dragon+instructionsPDF 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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 16608 bytes
SHA-256: b6e520106c9030869a372399340b9a812a9352dbf3c4f18a22709baea0dc2316
font_01_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 11392 bytes
SHA-256: 040df13263a1955ae0299aca7c28e38e146cb4b9aa0b52f3b1bc48fc5c119cb4
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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