Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdda260c09ae2319…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 22:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27a1bf8d61c75c70aef25ac71de00edc SHA-1: 16f1cec7b46aec0c6c3c9071decd883851b2f247 SHA-256: bdda260c09ae2319e2fe99d0d270b6e9ab3554ea1dbc2996713285d3458c7d8d
156 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 WordPress sites. These URLs are likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ee8adc3b---50687973560.pdf In PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/51993393045.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/3817282028.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b60a63680---75162071545.pdfIn PDF document text
    • http://nordavril.com/userfiles/file/zesijejiwerogokimedow.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/69535879421.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gasodedapaw.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/xaxut.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gazovirojikulowarifepo.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210601_94B660685D8C5F16.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///tujupirutonope.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305908d35b1---mabamas.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/jezabebuwu.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/gusaxawuzen.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4cf0b4aa33d05ee5c8f2e37768a89237/15858431899.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/bemugop.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/17623739192.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/59210764716.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/pulimibujil.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/60749768202.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f7941d394a7---49286738015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=speed+velocity+and+acceleration+worksheet+answer+keyPDF link annotation
    • https://mediaget.com/userfiles/files/21416636711.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_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 11044 bytes
SHA-256: b9b87db002da48c6f907dc05d3da94a8c0760e8bfacee2e023d9f3ebd27c74e8
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 18416 bytes
SHA-256: d892359c901e3c0faa15ed5e8384f8b107eb44440c2ac9ee3c5232b876e913ee
font_02_sfnt_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1