Malicious PDF — malware analysis report

Static analysis result for SHA-256 08abb255802acfb1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 14:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91ad44dee6a86cd1347d86edec7ef9b2 SHA-1: 4d9e7c5949b9c8163c4c63b72b589515fbae953d SHA-256: 08abb255802acfb13e5c6609f1efde5628bbc1a85a6cc9594451707d9e5209c6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=como+ver+una+clave+de+wifi+en+android PDF link annotation
    • http://boki.hu/editor_up/24650649683.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/febitopel.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/93414577229.pdfIn PDF document text
    • http://medica-brno.com/files/sukemilulovuwupugi.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/56414581523.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/sekifagixawuradokum.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/limekolenapuv.pdfIn PDF document text
    • https://derfo.info/resimler/files/gujagufik.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/garolumetupi.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/58555137998.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613857f636f01---10235754047.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/56254219884.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/96862644071.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/sarewugimi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/vamipi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xikupameji.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zoxenaxuzagimubagasijima.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/1442498152.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3eemckue3gfq9de8i2hbnabij3/viliwilalosulobedodom.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/31673013404.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/75698687657.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/63915968176.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c4mi7ck6bo6edvl5to7tsuqhd4/93099896309.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/pizadixalavotobureg.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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 20044 bytes
SHA-256: a532acce660f51dfadab9176908d8892ed17ef58ddfc9f2d70c6f5865546063c
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 10652 bytes
SHA-256: ffbbc7e9644e0b9a1c1fc1da5d03a6d64e5e7eae885442c76169bfd734c50be6

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