Malicious PDF — malware analysis report

Static analysis result for SHA-256 104044a19702c9dc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 10:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a618bc2338c118af8d204d7e5f2fadb7 SHA-1: 87a139ca6462c90a6ea1153e61e0f3efd6208a02 SHA-256: 104044a19702c9dc20d97d114e121f4555c00e5d0ec4c4d82c07f9fbd6a2b1a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160804e4b1ef46---77877984022.pdf
    • https://actor-conseil.com/files/file/92313168480.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160be1913e5a53---13811310189.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48af979e17---zawedolumuguniz.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecdbf3538---rivoroxuwupomezasaki.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d29bc604---84172693261.pdf
    • http://naphogacomposite.com/upload/files/mejoxixisiwirubu.pdf
    • https://daulte.ch/ckfinder/userfiles/files/mudorekizeraxuxezuxumume.pdf
    • https://tp-pos.com/uploads/image/files/42150808460.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/47455958998.pdf
    • http://gekon.net/userfiles/file/fububowegisejo.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e46ec3542957caf10d65896fc02df9bd/98261075081.pdf
    • http://email-database.info/userfiles/file/35146615877.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f238e3013f---movub.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106230124441115004alz5x.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607addb904ee4---70148940979.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00681990b4---pijokatojawem.pdf
    • http://sanphamhanquocymy.com/uploads/files/laligeviradogazozeb.pdf
    • http://holzbau-napetschnig.at/duzefujiposixe.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c7f9c17f---86765849258.pdf
    • https://zhbiotech.com/CKEdit/upload/files/zemogisukemo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vasanthi+novels+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd8.bin
26e13d338c59aa651087fb9727a99972346b42337f08c33b9d1c0659c7db2080
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD8 10716 bytes
font_01_sfnt_off0000d46e.bin
51463d6ebdd6daf674444bf8a1a60dd6c878650dc5151a4e8a287c5520bf0fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 20332 bytes
font_02_sfnt_off000109f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 16792 bytes