Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd554201bfc8bb5…

MALICIOUS

PDF

86.2 KB Created: 2021-08-16 07:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1007b8175ba13c2d5e9cabd33a289535 SHA-1: 5bea68c671290c659a80fe0a2394c5673d1d3dd5 SHA-256: efd554201bfc8bb543876e35ea1fd5a0e97453dc219c26ccf5a8cb4f95c3d9e9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=super+mario+bros+3+android+emulator+download', suggest attempts to trick users into downloading unwanted software or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pistant.ru/uplcv?utm_term=super+mario+bros+3+android+emulator+download PDF link annotation
    • https://autotrans911.com/thread/admin/uploads/file/99987630492.pdfIn PDF document text
    • http://firegallery.ru/img/upload/44960323939.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88b3c0f48---xesakewomusakafo.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/konaluriguxegudexekafid.pdfIn PDF document text
    • http://bastola.org/userfiles/file/sarijabososamuvisekotovuf.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7e64c6501de803946ded8ad6ed5c628f/29557524414.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/70569161502.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8320b4d2d---64685118191.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9182fb48---gisekezotusikuzar.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6d1568561---lawenemodajabegaloxux.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/wodigukilogunokabezi.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/zodop.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/pinejakozupavevoto.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b1bd2754---48576908078.pdfIn PDF document text
    • http://mega.kz/media/upload/files/gidumurigesivekejiwijuw.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b45f23895d10f0396fab020bc68f25fd/jirinojukotu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/39127379236.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/navejemiwijulateliruxal.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ef0207126b37c6957c613ddf40b5b85e/mosixesosi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/27443689235.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bamazaxijino.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef4729a7a---bipalumumorukigepexeperas.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/wudavaruzometogivaduvevo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/dofuj.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/19027717570.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609632bbe5b69---favekododulujisevuj.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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 17508 bytes
SHA-256: 6b813307a4c21dc0d24acf8f20cd7a1fd174b2d4ea5543f6deec5c85e94fbfe1
font_01_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 11124 bytes
SHA-256: 93c0951814d969d64f4e9f4ccb294c10be2ea52c69bc8613d1115cfa55c92ac3
font_02_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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