Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bae5baf304b65e…

MALICIOUS

PDF

95.8 KB Created: 2021-10-06 18:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc517c830882c486a03feaea5d5998f0 SHA-1: aa54e9b4e4a710a5bf82d9f088b4eed1c193ac8a SHA-256: 39bae5baf304b65ea3d75cd96a2ea12727a8693bfde7a7aaae2d20b7dc20b535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://garglob.ru/uplcv?utm_term=why+is+faith+ringgold+important PDF link annotation
    • https://granitabrasive.ro/editor_up/73868009743.pdfIn PDF document text
    • http://pmke.cz/pictures/files/revepivesize.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/webujovisunotixig.pdfIn PDF document text
    • http://datcat.vn/2018/file/nogakopi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/53139575985.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/22544454822.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/wozigekuwe.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/73133897274.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zagezinog.pdfIn PDF document text
    • http://indemo.pl/Image/files/17158103045.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6134a7c3c401a.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/koxufulugojimus.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/43471298210.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/wimikikatowufenip.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/nomitazaloter.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/74614995263.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/98369434924.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/619lterrj4jg4fqj9v3fvfl9s1/vofuwuzedenuga.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a56b98b8f---36118491133.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0b331f9ac---pufilupan.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a8ae51b36f87707bb0a3a5a710941514/2050146672.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xawapimomejoresukujobupow.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/88667609265.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_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 10920 bytes
SHA-256: e4e892ee50400b1216eb2bee1dc7511fbc47cf6dacf818a3038137b92d18e9e2
font_01_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 19876 bytes
SHA-256: 3bcace487568f73965807dbaabee011ae7d46c719b00c6af206f5eeef0b18442
font_02_sfnt_off0001591d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1