Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ad011fd68b165c…

MALICIOUS

PDF

92.7 KB Created: 2021-09-19 03:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fb2958c197f5a14af065dee3dff13dfd SHA-1: 53773ccfceec65b66f1e3f25cf6b1f6b06c9452c SHA-256: b3ad011fd68b165c9a81b5fe5c36c73fb08e83381fd8335ed3345d986721dcb3
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a link farm on compromised upload storage indicates an attempt to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://smidgel.ru/uplcv?utm_term=what+is+android+ios PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2cegg173a2k7h2vjfccqbsi2v4/ruvoru.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/livumonigibabakugeva.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/58769014527.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/ruduteluwuweduzus.pdfIn PDF document text
    • https://aokman-drive.com/d/files/duxisidulil.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/ketonaparerolije.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/51308017552.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/46555107155.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/diwepubegilusolufapolajom.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/67653789140.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jevap.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462d8e27eeb---naxipupewebusom.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/34601562421.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/74945736633.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/12985028372.pdfIn PDF document text
    • https://razredna-nastava.net/files/78763935976.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/jubuje.pdfIn PDF document text
    • https://tcremich.lu/files/files/20639309801.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1d57025dce87783d2cd5c65d385902cc/72611171480.pdfIn PDF document text
    • http://soc-in.com/data/media/files/86068336605.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/37954836235.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/sedubatididuwezup.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904030916.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/pamulinekokaxogomekib.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_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 10160 bytes
SHA-256: 9733dc9c6633791a20271406629a97a91e322bd531c06a1a9f7f5291fcbf169e
font_01_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 18356 bytes
SHA-256: d211257e93d75b3d7a8ae22472e1ef2d22a1b67b9a0def318cd815712f34eeaf
font_02_sfnt_off00014d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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