Malicious PDF — malware analysis report

Static analysis result for SHA-256 978ce40feda6ac16…

MALICIOUS

PDF

77.8 KB Created: 2021-10-10 01:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5cf4929fa30714e86f175ba80658ce96 SHA-1: 135d00ff946a8b3af88c39e84b0471adc09e47f2 SHA-256: 978ce40feda6ac163034fac4616d70327880b4a3d364fdb4f55f94af25464a99
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and does not provide direct instructions, but the presence of external links and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=evaluate+step+functions+calculator PDF link annotation
    • https://llc-sahara.com/site/files/gevageviziki.pdfIn PDF document text
    • https://palet-school.com/files/files/9578503825.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/penabupenawas.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/37146757162.pdfIn PDF document text
    • http://manenshop.com/upload/files/pevetevepitanikugepujab.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/28366547030.pdfIn PDF document text
    • http://arc-exir.ir/cache/fck_files/file/23118578273.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146463481bed---62146535464.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/08k19d91ueh2f11n3l8t04kfsf/29583532948.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/62395463487.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/mowor.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20211002231513.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/vurarukemogezijixabox.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/87281665007.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xovewubepuvubexulu.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/kipisul.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/tutomazevib.pdfIn PDF document text
    • http://skolky.info/foto/images/file/jariwabek.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/53324982520.pdfIn PDF document text
    • http://hanleyresources.com/images/kivofujeniwuruwolipag.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/kisaso.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/83095738276.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6f9711598018c1abe1743f65898f41dc/92142307772.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/nejepojow.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_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 18676 bytes
SHA-256: c2a6e40cbe5a243de63ffdb7e31ddbfc041ec0bc32cce6801421124e9bcd5ace
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 10620 bytes
SHA-256: 87b00eb69ee285c229f38bdd31bbe590e62e74bb2389ecfe18193276c985dd6f