Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88e395e3a82d147…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 07:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07037e77d46b418f6e173ca9dd4585f4 SHA-1: a63d70060c3c19c789c5df2817550aaeded5ca81 SHA-256: e88e395e3a82d1478138f8a3026e5e717870520115981068aeef3ff995ecf073
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=watch+how+to+train+your+dragon+2+123movies PDF link annotation
    • https://autosaloncenter.com/uploads/file/22544105306.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/43514508418.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/ziweruzeka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613809fc3d44a---biregus.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/98047714818.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/73906432444.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908090239_476520732.pdfIn PDF document text
    • https://andhimazhai.com/images/files/77731724013.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/xudugipupa.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/zaxowamijokowin.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/9407273441.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/72189508018.pdfIn PDF document text
    • http://atek-ent.com/upload/file/28705930880.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/60851786290.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210910_BCB0F7ED7B092719.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/99326290773.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/69870871236.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sadurinusukudunuletijaw.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/82630609161.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/jilazutir.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409396f1d0b---gozadodolofo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://besteva.com/upload/files/5265745421.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/misojimo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091709533419.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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 11472 bytes
SHA-256: d2ebfadc7938f886ddfa1696b98a2829275ee353f4d04c3a6c82459fdbb529ab
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 19044 bytes
SHA-256: c6203a50942c244c6d85663d7403703a5837bfe91a5c0ad40ce720bd58c0a465
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.