Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd16c4a623be32b…

MALICIOUS

PDF

76.6 KB Created: 2021-06-29 01:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 85417d554f6bf5923c981c1919c2bd3b SHA-1: 7cac6f9f454224e9cdb65b792cbaf54f1eb9cc9a SHA-256: 4dd16c4a623be32bc1c0014a1d89e8bdbbd8baa6565d258e8a9364ac40aec21e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f626886fa8---dikitodevibolapatavaniri.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c141b49ad---29617053923.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/lixajafitolovipibisepis.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/buvugalotibobepozamixib.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070436f26130---bozuvixekukanasojamubod.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5d7a7e598a50a6a7ad6a00177a3873c3/54639895872.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5b5e0ecb---56417011835.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711dd0cf1fc---zenodolonexafemopunogab.pdfIn PDF document text
    • https://mahae.hu/files/files/78098432812.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093184654179---19728243060.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/33518006086.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/dogabujodopabegudof.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3580c1b50---pobin.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/52087755871.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160856b3b7d547---1673633182.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092475443afe---98046004694.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/59019458444.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/20fb3086bdf8eb167dfaff41df82665f/15263170439.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/37302885373.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa166ae81---nilitato.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/42990010203.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/87190592147.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4752632b52---zosomaworax.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/da7d2467837cdd6f7e013980e730dc4b/tuvodugipute.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cc6693bac9f3854ee200d4debfbbf884/labipojojazesopigovo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b394195f94a7bebc894cf3a0ce30a1f1/tosevudexexuwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+you+callPDF link annotation
    • 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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 9936 bytes
SHA-256: 4dcf3d1caaaf246bfb0f5bba24decaf284dadec6e4dbc22d900577442c21cb21
font_01_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 17708 bytes
SHA-256: 21ee680025a5a435527c622bc946805d2659124344c5219569a64f30ba40e7fb
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1