Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdcdf414e9c5d04…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 08:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5858570eaf12b2bff2c3434c8e9c7a3b SHA-1: 1774301ac0fcbc7ee6f3c79311b76949e4c0e4ca SHA-256: 5cdcdf414e9c5d047ad2b82710d1f3357e76abf12ebae9956127f155554c67ba
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into clicking through to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://saconsultancy.com/userfiles/file/80392180653.pdf In PDF document text
    • https://bakotech.at/uploads/ckeditor/files/15221555620.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/xixunovegelugolabimuxi.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/28763757920.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4f0bbdbeca35599a292cf216883bba34/39134645735.pdfIn PDF document text
    • http://polipack.ru/content/file/setefanabukozozina.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/66078017933.pdfIn PDF document text
    • https://zhansq.cn/upload/file/sufatunekalofosawudos.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48155047184.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d199aaf---7864839099.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/bivepuzatapode.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/91876967265.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/febokerujegigexej.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdb811992---pujoj.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/xuligipo.pdfIn PDF document text
    • http://mayjack.com/upload/files/40547009145.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109061748155984.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/satikametulivogemixedalur.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/pamaxenibeko.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/38532167934.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/84417151290.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/puxibufibegiked.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/53694643377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=50+shades+of+gray+online+watchPDF 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_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 17356 bytes
SHA-256: 2852714577cbbb36bf1e054da8268f805043329b5f3786462e2d8dd5cac58865
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 11116 bytes
SHA-256: 1bed4094369f44bad7d877c2e50207f83a731183eb85da6e3f2a1cf65882e7c8
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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