Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b7c3bfade3b025…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 14:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e595663abef019688439ce04605abe66 SHA-1: 3c93a469c7073aa38efbd0a7dcd72b1be3b364c6 SHA-256: 36b7c3bfade3b025438366fc06683d4d7c7f5f6e0ddb63094f54b2a834c92a35
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138218e21de8---mimidipoloraf.pdf In PDF document text
    • http://unite-chem.cn/upload/files/24145753880.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/41388076762.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/wuxinitu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1ae84a774990dc6c7c3195b2d7357697/11884429755.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/1321892021.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/74827612306.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/45843454331.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/simesomojikefupe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351245bf984---lematimozitipijif.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/68328597104.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lajukutuzuzufo.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210904002544.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/baxinavafoz.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/93675932970.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/lozopipiv.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/sowubegalijopusu.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xodasamatuvilafelolegelu.pdfIn PDF document text
    • http://xycrusher.com/d/files/karune.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/manubixinitudeg.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/48615655490.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jivupimujeva.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/77861351454.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/14949569197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+driver+development+bookPDF 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 10504 bytes
SHA-256: 53d641cc2e5fa499fc46f139d2b557a86646dd17edaac3e6c716d0fd96db916a
font_02_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 17392 bytes
SHA-256: 746f1a64395725a206daa5ad6efc0a2d76762788b97ef6e613d0e041655056e0

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