Malicious PDF — malware analysis report

Static analysis result for SHA-256 28acb16abcb20f25…

MALICIOUS

PDF

103.4 KB Created: 2021-08-20 22:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d291dca5ad5ca15cfeba990e5c554435 SHA-1: b48f9985bea268cc7b442c1b0487bff446886a93 SHA-256: 28acb16abcb20f25eb767bf41fa49a8c56ebc1834ddb29e23090feaab953dffc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs pointing to a mix of disposable and potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e08e8794---mutotenomutewak.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/af82d47c7dfd0037c9eb908d7a4f5b8c/74878786824.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fesizo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffbc932f36---54553756561.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1b4b6566---73195478718.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdd1416f9---tasemixugolerut.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/52784567400.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/86241622122.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc130274ac6---26459796491.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/sf7s1mh9o6ofmarqnq854migqr/43923188517.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f31cebbd---xezujananelowosezezu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/32738283636.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jerudugelivopi.pdfPDF link annotation
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/pidunelafaw.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210714152136_zwi4y3.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/mezifezagoke.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4d4d2decb42e8b4872739af9c94dcb4b/42101631969.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/sexijelanoraviru.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/55472442545.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608860745cea0---xexuluzusatirekibopoxog.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/21215914603.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607112a69ab2b---28100979457.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e15ad4b430---99651568445.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094537702fd1---geganu.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/35076855541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=plazma+burst+2+void+unblocked+hackedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 11216 bytes
SHA-256: 1a80a84048d64e734a737b3779306520a248e32864cf08abcaa8e653d666c826
font_01_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 18496 bytes
SHA-256: acc762d2463152408bd0446666b8b83773e0e86171dafffc79f3793f461a324b
font_02_sfnt_off00015a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A75 18440 bytes
SHA-256: 9b8614d039eaeca0400cd224b911d59b55bed7126d309e7162551e1d65e6f4c7
font_03_sfnt_off0001772e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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