Malicious PDF — malware analysis report

Static analysis result for SHA-256 546519b80ef99d41…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 17:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2fbe7f23a170ebb5f2cd2b80ee37cefc SHA-1: 53bec98e727fe2c99fe0f5b0ed19df910072f6a2 SHA-256: 546519b80ef99d41ebb5e9438284ca40ae63ace760e89ce93bbf44f518ce98ca
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, many of which point to compromised WordPress sites. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=lite+star+apk+download PDF link annotation
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7d615f23cd3d2bc91169e3b24c003bf0/boxowatapilerajunotedoxi.pdfIn PDF document text
    • http://hybsch.it/upload/file/jefalazifivitemufitogaraw.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/51885364337.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/nabanokajamugiw.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xopevujimut.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/tetipiduvivasosedat.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wejivex.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/nujovojirulunovamemap.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/33287384612.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/38758124650.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/84765460907.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/zotidevisudodupaledo.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/panaxuvikamowalewebuso.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wujopew.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/bekam.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091802331073499.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/4758928814.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210910_C127265A96619616.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba82488d1---wujabawarimuguroguj.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/jeponodekeketidoxenu.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/paguluxipoxetorifo.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/14259942630.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/megavedinap.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/ruripupofesagelumazake.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gc4n8k0ihjaq9th7jo8ahvg9e7/92911363790.pdfIn PDF document text
    • https://camelcarpet.org/d/files/supozikenukijogikedut.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xopelubozado.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_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 10520 bytes
SHA-256: 077e520fe21b7c3fb1d23d49b95b6a9741768f2d019639d7668b2b26f2412152
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 17896 bytes
SHA-256: 56d95607d4bbdc4a656d871be9757cca5f4663eac89756911e8d1df5cecd55c1

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