Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e2b352e703c98f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 14:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2db0edf4ad39dce86a78500c6ee19597 SHA-1: 217136225a87c1eb330378394012e74e4615e3e1 SHA-256: f9e2b352e703c98fd77ba487e563a6f330f9912af4668ab6033e9ee5ed6d75dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs that form a link farm. These links point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=dream+league+2016+obb+file PDF link annotation
    • http://davidhammerstein.org/ckfinder/userfiles/files/30616453537.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/64542237134.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d854a5911---nedevaritimife.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/dirabitogugibur.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/4469917122.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/turajalisa.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/xatufota.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/17765877168.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/wumeled.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/zufulubalutonukivun.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/19181273520.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/tejitididazalozutobulo.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/dabavituwevirawoxuvekuret.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/legoloxepapeberarezoko.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140e528dec44---13923189647.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161420d2d9c7ad---19099214240.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/vawopezegafi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4bcb6a61275f77fad5bb8774cf314f4b/miwumoponuruxuzonoga.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/garer.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090111140728.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e7d5476b---89994854786.pdfIn PDF document text
    • http://ccadl.com/files/20210909061708.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/95629275631.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/duxutegetiwetufifizasifu.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_off0000c152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC152 10892 bytes
SHA-256: fff4c2b1c57ca9779d591206369e02fa2de81aafd5b144dffb136155519024e4
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 18036 bytes
SHA-256: 24671db34b6195790ef49f2df4d31bdf2cf81463a306f45c10c554b5787f24df
font_02_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1