Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e516d044099b86…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 13:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27c5d7c23dbe0b2395ed48bd2f349daf SHA-1: dcce8152eebcf35fe7a3c9137659ee4d39356d6f SHA-256: 38e516d044099b86b27d19abd3b6b2dffb572efbb3dfa9ee8d6773e887b037d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host a large number of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=payment+of+wages+act+1936+mcq+pdf PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/o84el05vu2cjut0ga9cd455k6d/20402313616.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/50360975729.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/72890811939.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/wapuvafudofominoju.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/gujiw.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/33368400755.pdfIn PDF document text
    • http://agermag.ro/mm/file/51482402429.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfd3ced6c---64111887934.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f02e97f21b3e79b7c5a054be42ecbeff/97776580602.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/69665898363.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/palixikitav.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/xemobezojewamir.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/xifoduramaneza.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3e19edd217b1639dbcaca90ff54e33b8/bepisumolu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2a5r8rfdfpb4rpt1u2advt3mf3/41049563986.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d928ca653---jifufiz.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/78471863382.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1a3433a22---turedesotolajezi.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/54893834492.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbef61587e---83603252050.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/sulopepixolafukun.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/68693464948.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab730e5ce8f---zesabomo.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/87175655985.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/29843134065.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_off0000bf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 17348 bytes
SHA-256: 54cb4196e1129de5d47fdc34f10df24dec41700fc599fca806db0be2fd16927d
font_02_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 11632 bytes
SHA-256: 6832201e3743a2f59111c04aa72e56a34b3fd5e84b80856b9045ece3179ad702

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