Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7adc3277879a98…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 00:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af2ee0b82172d4962677ca2443b6b5b8 SHA-1: fc2995a6d6cc8c1e1d3cdf76bd1ac70544e5c5eb SHA-256: 6a7adc3277879a989808bd5ea3da65d117cfe95801f2b71a1c7210c466fd9dd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hoangnamjsc.com/upload/files/23992407741.pdf In PDF document text
    • http://ledson.ru/upload_picture/60598331774.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa1bbeae9---lunarirovomewenuf.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/69929276788.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210823_9C22CF3109942C91.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/atrgajdo7heu6olcbc1t2rvkaj/sarisatipiguvomujudit.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/85881dbfd2322bc5091ded8f888cc0c8/juwigesebo.pdfIn PDF document text
    • http://wxjsyd.com/userfiles/files/jixiremutexo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f6ec5fb24589b703575bca51983711c6/40605592259.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08d719880972f50c70bf574be17a532d/46826827254.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/walemofizulijikuruzi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba00993ce---24467139728.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/6611098036.pdfIn PDF document text
    • https://marosme.ro/hirek/file/dodavajedefuterovov.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jotejewarofazugekotuk.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/bfb89e53f77bf41654b0f062959ba589/66219147468.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/7430693278.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f8a31ebceb3998662b89822564422bdd/zobepukixapaz.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/36631342114.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/aef5d8ea65c1d5b1699b51b226262f2c/jagogivax.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/faneputominowofi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c184700fcf6---paxebuxe.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/vadipaloxawikujido.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/fubokoremesenotumek.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610edbb09b6cc---23023237229.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/19214342323.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/60627881290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=calculating+pressure+worksheet+with+answersPDF link annotation
    • 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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 17796 bytes
SHA-256: 40d39a8a7fa63fc7e9dcfb0e8505ea24bb79119e9dc25bee1d17fe6edcf01887
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 10960 bytes
SHA-256: 52ed63d7f3b3479e52c83df7b2fad2190314e4e5b05cf86580a15eac46516c8a

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