Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f55f6c903db321…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 18:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc58b64d911b8d41da002d0a1550d3b8 SHA-1: 2db3fcb8a81b44ef30a9b1c47ab6c4f806cae1d9 SHA-256: d0f55f6c903db32138135393abe34a367405a778ecaadecbb32c9198f95b949e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and is flagged by ClamAV as a phishing trojan. It also features a "download button" lure and links to external PDFs hosted on compromised or disposable domains, indicating a multi-stage attack. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/bazomixot.pdf In PDF document text
    • http://twinmd.ru/userfiles/file/sagipuribajefazuvupeziwof.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/poralevositoduzaperuwa.pdfIn PDF document text
    • https://argumentua.com/i/file/fejoxanerakuwivunevalitur.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/28189686801.pdfIn PDF document text
    • http://juncheng.tw/upload/files/34835231474.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/19601987594.pdfIn PDF document text
    • https://maria-galland.ru/files/file/danovaw.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/37472784926.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/53677544585.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/lovazisuvad.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gsvdg9tpqeost138q60ics0fbd/perivebexofe.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/zebiluvoruxef.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/33782397347.pdfIn PDF document text
    • http://fteq.ru/files/file/77896508191.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906034915262108.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4defb49a2694d47d90603aa8176235d5/nujogonadirosuzurevivubit.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/tugisimebomibozazisaxid.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/mumudibukesebem.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/nuvopo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/35334954031.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d3b90e84---bekifuzasolexune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=singam+3+tamil+movie+fullPDF 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_off0000bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 17240 bytes
SHA-256: f316e1e105d58e15acfd18f76905c8052a1cd7604dfe339ae422560f04629e47
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10704 bytes
SHA-256: 82e7cdc5b8296dcc3cd8e84671bd4556d29e98ddce564653f6563e5a30bae1cf
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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