Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4d0feb20c43730…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 22:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 689aded689d74e601bdeedcb2a60a582 SHA-1: a26a18d556f7f4ab59f7b86a675f14ded74d90f5 SHA-256: 2f4d0feb20c43730ecb994fa3abe2a8b3eceee44118951d049a3ef6dbbc98a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba145844e4f---kusexevajetuzekiritida.pdf
    • https://limmaginebistrot.com/file/42762620826.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dc12abdf3653b4d1a53eb550e1aaf771/7522281316.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c2t4g6v73hk9bb5r1molfrmtp3/jojedimujukizusuno.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160759cabe30cb---tukepeweru.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/97f9faaf1db7df6b1fa0072dc22a627c/depesugexeledifavapazumak.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe10c15264---86368335754.pdf
    • https://uniqrelation.com/userfiles/file/sagogopekifemipifabaw.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/83549772ceb730f0f019f1bcfb090be1/82864709254.pdf
    • http://rideabikenews.com/user_img/files/bopokuna.pdf
    • http://asiadomainstore.com/userfiles/file/1645332006.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809ce84fdaa---40395473856.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d850369c0---motunuxufetedadatobewefi.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/2071644759.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/46edc917bb7ecc260ff61d087984ea32/tikoweturit.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075713f1b11e---47276069670.pdf
    • http://www.cbs-emballages.com/upload/file/70936732173.pdf
    • http://mynigaoe.com/upload/file/20210616025111.pdf
    • http://detaycopymatbaa.com/userfiles/file/56513969533.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bc1576f85c02ce18b7b04254e1c45cc2/24448736333.pdf
    • http://unseenadventure.com/userfiles/file/30005995357.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unlock+lg+inverter+direct+drive+dishwasher
    • 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_off0000e99d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 16792 bytes
font_01_sfnt_off000101af.bin
e4741438ae2a37a16a7bea8b65ab21536dc331bdf6a6d0920e6778b9dc64056a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 17248 bytes
font_02_sfnt_off00012f0b.bin
d72107946994363609eec7d0235229d81a2ce9f0b1c503988ad99738f4c3b72f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 10984 bytes