Malicious PDF — malware analysis report

Static analysis result for SHA-256 934c18381600312e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 21:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20611e63f02f7476a0bf6886b96db798 SHA-1: d10eb5ac7a9551db9e3cc17d78157e416580800d SHA-256: 934c18381600312ee7cc6af4eb352d4dd55941d73e15be620c085574c2d19e7c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm and the use of a game download lure indicate an effort to trick users into visiting malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=forza+horizon+4+download+in+mobile PDF link annotation
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/xixalojikiw.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/58569503621.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/22302415269.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fezupugifu.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/tevidujom.pdfIn PDF document text
    • https://unaizahic.com/Files/files/lejerugonadolozokikumem.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/39463913170.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/gixerukoxovetukilosumeno.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59957500762.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/kaviwegenawo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/vetumupuribamaget.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/87164583253.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jupagufe.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nenenoga.pdfIn PDF document text
    • https://proxus.nl/file/terejuwin.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hgenj5fvb3tja7i2bq8qp4jip6/rituw.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/lanajimowukowatidas.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/bipijutudad.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/29212545586.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/gedekuwideromeb.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaea7cd352---21080454138.pdfIn PDF document text
    • https://mimpidia.com/contents/files/norepipukobata.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ea2309ad---veteragupaxuzovubog.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/ramex.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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 10588 bytes
SHA-256: a81a5a3ec279547605d64237e811c7f516b1d959ad7054cb6101ba8c959ca66a
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 18032 bytes
SHA-256: e5a5914096c8cf2e1785dac077a16bcaae61f454af657b2c522f94bd926d066e

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