Malicious PDF — malware analysis report

Static analysis result for SHA-256 532f4457bd800e48…

MALICIOUS

PDF

87.5 KB Created: 2021-08-14 16:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 470e3f627f8eb0216912007a966df571 SHA-1: 0a69341b5fc074469c00efcda633605555bbf863 SHA-256: 532f4457bd800e48bdf58f6e2a0c939d435e259098ded99ebd3920e76b21b0c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the compromised CMS upload links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c2806c15919ffbe75a56383dfd079ff0/53400323263.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lexigajevodigiw.pdfIn PDF document text
    • http://rurisnet.org/images/file/zivoxakuvijazu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bawifefo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608094cd9c091---gupojab.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd10bd881e---wabopowofuk.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pikumi.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/16538850619.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/guvogupizuvedolerinabe.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210705_175429_9789.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gl1lrghrfelmpb1c5bm206687b/niloxuvapemiwelazajufado.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0cbe794a---femoxogugebo.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/sokax.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/36508020453.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/64659159910.pdfIn PDF document text
    • http://riph.pl/userfiles/file/samekikojabobodubivubef.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/pusagudukiz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7278a90fe---95049383262.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d854bb4da9---mezub.pdfIn PDF document text
    • http://bociany.sk/media/file/nijaz.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/vewesazipikisizap.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85d9a059f0---77604576734.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zatorizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+reverse+phone+lookup+for+freePDF 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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17352 bytes
SHA-256: 9360f308eb3550916ec798e86e31e9a49a208d29434b448c0141786c50433fb2
font_01_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 10440 bytes
SHA-256: c61bdf168cc8abc89680ecb63c409005186f58a042dd992763955b25532a3576
font_02_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1