Malicious PDF — malware analysis report

Static analysis result for SHA-256 84784849484276d8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 06:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d9196c324aecdf0d0167383364c33fd5 SHA-1: 890730166eb89332fc94c4a6aae7be11deefb153 SHA-256: 84784849484276d8f5a847d6488461fe4d2f86f2ecf9d896de2838d19245431f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous URLs, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://huntic.ru/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+book+online+free PDF link annotation
    • http://unsersohn.com/images/file/xemujoxufeneb.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c2dbb361---49777787702.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/vosofupibetufuluk.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/8999322335.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b2f3878ac---50019070055.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143e0a0141bc---8913910894.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/nisavetigoxubekas.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/10797261008.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/8925591864.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/62192160073.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/wonomepisaruziwutovitogod.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf605cb3e2---11349428076.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09d928d43---dararixofozoragetaxek.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/lenaxel.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/fotifasaziwatebowuwojelo.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/47488021238.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161412f07124ad---pajexora.pdfIn PDF document text
    • https://digireg.ch/upload/60597609288.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/gumamujajepeje.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/fojuwomajuxoxotaz.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/77006060728.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/kusojawitulejave.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_off0000adae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAE 11220 bytes
SHA-256: 41278b120533987d6dacc28da35522ae0e32b4793b92eab87271efff219035b4
font_01_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 15336 bytes
SHA-256: 0fd7dfcd740f8a7a208e3430d9d8160303440f0f8da614f50692d16e5c960ce4
font_02_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1