Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2553744afd3f792…

MALICIOUS

PDF

91.6 KB Created: 2021-09-18 03:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e40a766f03095440d99a539ae6de318 SHA-1: 414218901704d13f4b300bc5b3a502ea078cc0a9 SHA-256: b2553744afd3f7929aa9288bb63795bdf526826b17946364e0ed73eed554ddda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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.
  • 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 https://oniceh.ru/uplcv?utm_term=alphonse+daudet+short+stories+pdf PDF link annotation
    • http://mgbig.com/upload_fck/file/2021-9-2/20210902135045124997.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75da06ea4---xadebefalaz.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/42695122465.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/bifuxaxu.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/7316301921.pdfIn PDF document text
    • http://hiniceshine.com/upload/volaginonazalafaxogomisi.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/51976699082.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/jadurepik.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/penobaf.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/mobasalonexufugotu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/nunuvalokaz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/00a433dfcff547453831ff756675e797/bozonamupobarazapumet.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92094150c---87591018762.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e961111f805ab229d37eef53fc205086/89274690684.pdfIn PDF document text
    • http://ge-mak.com/files/67927336129.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a7e6174b0db737c3a0b21fa7328d14a/wonupinagiperipiripomo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/66310250783.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210918013617.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/35642690868.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/21767691945.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8d6a3fbf7af04a42fdd4ca8f3bad5c9b/xumelezelo.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/dolakilovebi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210917183305.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/64101938280.pdfIn PDF document text
    • http://perksys.com/userfiles/file/15845096692.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/502c6da2c8521ffb25c3a558510f0fc1/70348649276.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kifinoteg.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kamixiduro.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_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 18668 bytes
SHA-256: 5f03fa88c13ce8556a5a0a657da930618a7c9ad131f1467c881e662cd8c31cee
font_02_sfnt_off000147bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BC 10676 bytes
SHA-256: 5196c34df3f79f938919f7c536c08aa3208e0a110937d81fcdb3206ada8497cb

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