Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b3f3cdf134766f…

MALICIOUS

PDF

103.6 KB Created: 2021-09-13 12:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f0dfd224982a8e5751440dbc025d353 SHA-1: 9f1a18f9de327b90676400a55e723cedf86ff9dd SHA-256: 89b3f3cdf134766f283a8c2c4e13b358415b77f976a28d9735a0062b61521b67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm intended for malicious purposes, likely SEO manipulation or hosting further malware. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 https://irlanc.ru/uplcv?utm_term=asa+di+vaar+path+in+punjabi+pdf PDF link annotation
    • http://straps.by/ckfinder/userfiles/files/31987694147.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/mobekebabepiz.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/nikonisased.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/46865479421.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109030610025362.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/werilasa.pdfIn PDF document text
    • http://melabo.com/upload/files/33914427440.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8d8q9ivbu52cn7temudckmgkcb/82828071918.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314cc0dbec9---rivisa.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/50716997170.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/430543236.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/120114023175.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/57868884279.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed67def96e---gipepejuwavufevafor.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e88ee60f---60666586878.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/sorofuvupefo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/86746881202.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/78912499389.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/76588550962.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/27541162592.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/juneval.pdfIn PDF document text
    • https://rajakedua.com/contents/files/41689559179.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_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 19308 bytes
SHA-256: d2c9fa7ad5174101ada73b2044804c48440aaadc10edfb1f2bd34e0db11cc554
font_01_sfnt_off00016064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001787b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1787B 10712 bytes
SHA-256: 33c71d452b022f778fe9d185ba13d603c9ac2cdfb2afca5bbc39a9b0e294c0cc