Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1baebff52a37ea…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 17:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f35b0e83a767f7b61b5615a43fca1aea SHA-1: 0803a82bb7329ae9ec2686d9ed64ea5acfafc025 SHA-256: 5d1baebff52a37eaf21755b0624223e5076cfae8ce45f6597a6bbed684a2876b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous external links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' lure further supports this, suggesting the document aims to trick users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=hard+and+soft+g+worksheets+free PDF link annotation
    • http://mea-travel.pl/userfiles/file/tixugaw.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/zedelixoxoxivaxawoniwelat.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/66393506980.pdfIn PDF document text
    • http://allier-genealogie.org/File:/nokufamuv.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/75892883816.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/sunotubab.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/96951653119.pdfIn PDF document text
    • https://denimder.org/resimler/files/35375055009.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/kaliwime.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/pitomubolekexe.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/6794834199.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/35238804016.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43190129894.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/42992844357.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/97920156826.pdfIn PDF document text
    • http://www.520amis.com/upload/files/59965874866.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a4ddbb8e017f68c9aaeaebcb0db44d45/18086996772.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/84000253879.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3c00646fc98d14b63687fadc482a39a2/99823676698.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348cca21c88---jabakugixapito.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/18826719471.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/webana.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716a000b9---78645252236.pdfIn PDF document text
    • http://btfa.tw/upload/files/bekunevanasapumerelevi.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/11939166191.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b131536c5---viwusizuwusevuwumuluwado.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10664 bytes
SHA-256: 70fed33d600e7cc9d99a6ff77006f11b23a0e60028952f21734dcdf73736dba8
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 17024 bytes
SHA-256: 6ddc3f6d8fe4b8bb11b09da926482db983fb436dc8616ff895c75ff55d3e5ce7
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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