Malicious PDF — malware analysis report

Static analysis result for SHA-256 0240428a39d06c01…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 12:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55f3182c4950132fffb5101cb998ba98 SHA-1: 220c8f329e3bf8e6a5b8e232d7bdf6d093fcd965 SHA-256: 0240428a39d06c01dbc44bd4918d2cf5e77e79a1293c244a8ff8b93494ec79c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=mean+median+mode+range+interquartile+range+worksheets+pdf PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d63948cd2d1---kewifukerasonexati.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bekukedogenolefizusekan.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2c043325ac7361f8d43540df839bf5b8/85406292773.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e4d514558---81895680195.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/nesaxokikifajuxutol.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/24478207704.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a6cd58d7---pawadif.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/941eb1d4b51403e0a0a89bb761669e04/51221082510.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/jovodufujuvaretojodivujo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160741e4008ece---82667675803.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086244801fd9---51123817642.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076689dcc101---burebivubivuta.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/27714000347.pdfIn PDF document text
    • http://inncredel.com/uploads/46343260129.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/61377788414.pdfIn PDF document text
    • https://ikansambel.com/contents//files/jidurisapapizuwivilinil.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bigajusazitadu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b70fd99193e6b48f801992bae1900fdb/47427141563.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/kesokazubulunuvipagotumav.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d9a140c2706812df1c7c37701b0bc48d/57023777015.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/98949716641.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/65931173815.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/remofadolasotamuzurunesen.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_off0000baf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 15932 bytes
SHA-256: 7df022e6fbbb046e48e90eb36c3154a8ce70f13d23d75962323e86a0445093d8
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 11364 bytes
SHA-256: 68ad83ec3f5e3926a8dd426271707af3362c3496cfd14ca5929845eff58b9bfb