Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0adb9b25594012…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 04:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54ec6b017bcb19fc139f10f8d746a26e SHA-1: 4cffdb0cd87557eddf6ee8b04733c41ad958f0f1 SHA-256: 5d0adb9b25594012fa6eb3f17059dfd62f047a5ce159547c5c4d0d1cac7f9c4e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/95c59d645b18cd5202175fd4bb96a8f5/luvev.pdf In PDF document text
    • http://qianxi.cn/filespath/files/20210822025120.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/litewu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d2f7b4ee---51177253133.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9223b724dd3764e8328818d6ba3557bb/zobojagusuzijivonaxixala.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6g5oivvmik3jle3831ha9k25d3/nigojeromizotokajogamez.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a55fcfea08b---nizonulatero.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/barokefewukobemu.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/65166928865.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8720acdd8853c960dd950170d92096f1/96151650215.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/871156806226a455111843a59eace81b/vamejiporunogegudanomivut.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/bimowapebijixogezulix.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad79791874b---57361694076.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/llf5lrl0lje3j9k47m6tkl4s2g/94656470519.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098b137d12ed---jemogapagamaxujituw.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/18399936858.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/jinulolimul.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/libadopo.pdfIn PDF document text
    • http://airfa.it/userfiles/file/73456807754.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70faba623f---ledovunofijaxiwot.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/64047386737.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/juduwuz.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/27449572250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=formulas+de+fisica+para+vestibular+pdfPDF 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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 10960 bytes
SHA-256: e81b86de8845cd1a1d14e9f5c5982ff0a9908b3d943f60733d50ade9d163081f
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 19260 bytes
SHA-256: 224e75f9d0dbc44092289716ff32184979d278d4ac64627aaa053e4541198963

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