Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5ca86b71829250…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 19:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6eb123f5f6e5f011e985617243c06ac7 SHA-1: 6467e4b5c28a831be28a1e15e18ec26f9cc6f7ed SHA-256: be5ca86b71829250908142dc19218e4db221d5a2c3d9d96c9eef0c35cfe6e1e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=interviews+in+qualitative+research PDF link annotation
    • http://fiumevivo.it/userfiles/files/kolufakor.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3827033c19c318be8b5fc17a3d54d70f/8823497465.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9b8a9eda3fbeae0afdf322ab7b45886d/zulidupowog.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e83lu6vfkt8t2q176t1qt88hu1/degalefexep.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vabamavogesipelejufixamu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/38b7cd7c2c365cf1e21476798cfa7cbd/sixexegavufox.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23a9e269a---76813208897.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57366653600.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/dezalapilugesiduwas.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83d94e7a---65679916287.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6mn3ileo81qnoude5b92jrq58p/36414918965.pdfIn PDF document text
    • http://web68s.com/upload/files/toloduposilidobolapep.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/87086467455.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6118f86afbb6aa09ae7817f7469b9b25/pogol.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607812ba0f9ce---taxojorunagifelikofab.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863348fa0a---bizovororopokukatonewowam.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/62451385703.pdfIn PDF document text
    • http://ezibra.pl/upload//file/19602177492.pdfIn PDF document text
    • https://t2sc.me/userfiles/88614383574.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r426u2rlgrj690rjo829blng5a/53098563082.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/612d1ed9aaed7f8c38b87684649a00b1/nenuxijupenobafuvava.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_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10556 bytes
SHA-256: 5442b74514ec5586a07e501dbf8d7fa3260b966726bc94467157dfbcd25066b8
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 18316 bytes
SHA-256: 614f6892c02e560724f283efa482afa2f1d01e91f1db1e7657a2b1c468b404ec
font_02_sfnt_off000134e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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