Malicious PDF — malware analysis report

Static analysis result for SHA-256 854f3da04dfedb5e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 09:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96d73b0268ff64a3ca5b6e5882a315e4 SHA-1: 9fa9d3ec5ab090f12a9021e799fdf1fe811fc1f1 SHA-256: 854f3da04dfedb5e38fe19a3a86c0849b91e1d6c93050a9f017d5d1989e71680
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or phishing lure. The presence of a 'download' button heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=addition+and+subtraction+worksheets+with+answers PDF link annotation
    • https://castilloexterior.org/ckfinder/userfiles/files/vakoxugekawiwejiwono.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f09fbf28c---donuleman.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c8a9b662b68c1d26f28ca775daf8c7bb/zedomipisa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7fe6b7ed---85425504050.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/aa62f8cc3670b3e0764186a35474c304/46214134674.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/cda1f2827371461ffac0d7b87ad60c29/vutakepusodures.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/legusurunuvifaxaku.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/mezusulikekisumo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/4862362408.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/worilatej.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/me3u271p2ngogh18nmer90342o/54086129947.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5lhrllcs5l5a08hfd63qrdp5u5/zojuzosavorube.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/32435795120.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/66875522248.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c7775abb8b62df4e94c40aea4f260220/gipebukek.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd2435d1d---18773721124.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/94746858435.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/vetumokadosozubi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83c93f83a---gukezuribozuwerujudal.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/516d043112ad4e32c8705ba72655a027/33479588260.pdfIn PDF document text
    • http://2440027.ru/upload/file/80549348706.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/60924247962.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/forori.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062813035611.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/63acf493ec66048f7f4f63cdf89d3156/mevuvipejonujul.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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 17788 bytes
SHA-256: 74a2b30531cfe7f56fdf1da457c6abe79a2cb994f041cf52b7b552137c329004
font_01_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 10820 bytes
SHA-256: 53d360f7b3ee5eeb721782c9ccd956731f08746994a5dfdf774f5ebac96af11a

Open this report in the interactive analyzer, or submit your own file for analysis.