Malicious PDF — malware analysis report

Static analysis result for SHA-256 93092895cd5e8545…

MALICIOUS

PDF

88.9 KB Created: 2021-07-19 11:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4a1b86f51f847bcb9456bebba9a1b78 SHA-1: 6369043acf322699009062ca9421a378e5537e05 SHA-256: 93092895cd5e8545b5c880a925e204f36c8632c54d40263763c846589821d3d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608348b12e938---ludaradugozawebaru.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d182f852285ea4d6b5651cc4cb553cb1/67264676802.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd1a61a69---rililodowutapumikefujurar.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ff7d03b6---bumizotinuxidujazexuvebo.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/jorukosijis.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5df9fdc0---marelonusopeziwinesevuz.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/55479835771.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/bokuguvikopedutomu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bisexikuzo.pdfIn PDF document text
    • https://cubic.is/userfiles/file/gafuje.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/sefivovuserukofowuluxele.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/81de445d6bf84fa38bb497a623a23571/kavorogu.pdfIn PDF document text
    • http://aa-nusd.jp/sezokumafenilikezutero.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42d9925f77---80392707948.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/28826356286.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zuximijigeladozoburuki.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a201a3898---60494305740.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/balozu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b446ad2aa1c---60767369685.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cba22199e405a4e066677465adfe5372/1494209202.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106061545175547.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210717_7B093D28AB486D3A.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a816216af---kejejadagi.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/88362139175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=intellectual+would+you+rather+questionsPDF 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_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 17144 bytes
SHA-256: 11836f85680947837edfa2114d5be1ad45153d4196e981174c4ddde0c7bb40ac
font_01_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 10864 bytes
SHA-256: 318d5c3df51eecef56e28c069fbaf05d0c3be35bd5eafae7ac13daede7d5b8f3
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1