Malicious PDF — malware analysis report

Static analysis result for SHA-256 5802465a2280a2d7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 15:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fe9902ba3021264bba4240f5b066f21 SHA-1: 86ae701c740d5696956eb870fc2c4d75c149112e SHA-256: 5802465a2280a2d7efbe192e05af97b91373923356add915d7e8efcb2ebfc481
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=regulatory+affairs+cv+pdf PDF link annotation
    • https://learn-atdi.com/uploads/files/62985761476.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/19736810629.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/046ea179939afc9b282ef9ad5f9fd407/fogebiratisew.pdfIn PDF document text
    • http://kalikraft.com/images/file/pukixan.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/5962976290.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/xakovo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4510ceb663---lonodixomap.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6974de2b2---93561868931.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/94838253783.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aab877bbbab---xufibelusozub.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/8252205725.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ee6996ef235fff61ebdfebcc5ae99b17/40900086746.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/98663486398.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/9122681021.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zowaxadikapeku.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a0c76c6c---72272137903.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/8494883828.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/58ff9e44d4538495556dfdd7b0871afe/sajudo.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/47574512685.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/waxefesi.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/10135739443.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/muwakalifarebinopaketegiv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e6f2c8cf903eec084879fc8988165ebe/54350597537.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210814_45D0A1B6D56675A6.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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 11016 bytes
SHA-256: e8b4c6bf9a1db8a84188a533527e4233283ff3f1aed0d3138174c72b82096517
font_01_sfnt_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 17728 bytes
SHA-256: d4b0b1edfe6fcc27dc6c3537aadc72785adf5f785c41d40aed3829dd98dfcc73