Malicious PDF — malware analysis report

Static analysis result for SHA-256 241dafbce5cdff04…

MALICIOUS

PDF

85.6 KB Created: 2021-07-10 02:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35f1e9f801b545b3b7a285dec1b65255 SHA-1: 12146bb8ce4d446effb599c3217f5f3471e78e01 SHA-256: 241dafbce5cdff04928dce3d7de8e6a6f25154a410e91be964808312fa2f51cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads, suggests the PDF is designed to lure users to malicious sites. The link farm structure, particularly with 'utm_term' parameters, is characteristic of phishing or SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 http://argol-editions.fr/userfiles/file/diraxajeberur.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927ee3b49b---tezafawunozemijidelazoj.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9165cc59---60334754758.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609797f06d1a5---92441720083.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9945830223---xodedikedetowa.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7a6a1e93---pewilefuwu.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a247e7ed993fdeece9cd8761048cb2ec/desomanisabeji.pdf
    • http://3qlohas.com/CKEdit/upload/files/872069054.pdf
    • http://loveperfectionschool.com/upload/file/76792502250.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a597080519e---xowadikojomerorig.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ct3s362526hjgtmr0qagp0oj72/73909111650.pdf
    • https://termoformat.md/img/files/modelavuwo.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97346140176.pdf
    • http://cobansut.com/userfiles/file/vuwawivikubumexetofire.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4dq0oc548utu8pq7qp8pld9hlv/57041170885.pdf
    • http://dobre-jaja.com/Upload/file/74286435216.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/17598462467.pdf
    • http://desushibar.com/userfiles/file/wojemaveposemazupebamusem.pdf
    • http://acudrved.com/ckfinder/userfiles/files/76498032789.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed81303f7a---mimosupujesazo.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fbaec8081---76041975998.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=thick+cuticles+on+fingernails
    • http://janyska.home.pl/_mjanyska2013/fotki/file/62307646585.pdf
    • 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://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_off0000ee66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
font_01_sfnt_off00010678.bin
5fba437f08f7c4ff0df12eb473b71ad2ddda21d41ae7819895e41517e1c8f97e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 17244 bytes
font_02_sfnt_off00013304.bin
a39b783b944ca629a87a02bbad6062a7a55cf9d7374bfb113377eaf00b275d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 10772 bytes