Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9863ec2db6a0a4…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52e4fc50d321fcbc14b81796edd3ab29 SHA-1: 61c9ac3d7089bc5372532b30386f964abee0a6e5 SHA-256: ff9863ec2db6a0a4bde6b3f973b01ccb8052e81a7d70e5017c709db14531ccbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this document is designed to host a collection of links leading to malicious content. The embedded JavaScript, while not directly executable in this context, indicates a potential for further malicious actions if the PDF were to be rendered in an environment that supports it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://swift-tw.com/lcc/upload/files/vasuk.pdf In PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/wetijisaradiripu.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/wuvidezazudira.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/37380368133.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/4170702987.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/24187211174.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/23206278635.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/14193640555.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/pugiloliz.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/givogaxuwiwaxixes.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219151626436306.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/51458225293.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/25547186401.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/95798179287.pdfIn PDF document text
    • http://abnicum.com/files/file/tomifixiwizuriwikisumi.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/fupaxuxikimeporidofoba.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/pemositedaseleside.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143f65f96a32---2156023449.pdfIn PDF document text
    • https://ferropula.hr/files/91551174279.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/gowejajojigavibulefuvota.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/13050954250.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/96439830772.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6710ca7---dobosibigigobij.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/23764656644.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/37617468736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+sms+app+githubPDF 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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 18320 bytes
SHA-256: 12f44ce4d4ccb430d918932718dcf8b99aed1a4fc5a343d804ed53993ea5c3e7
font_01_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 10880 bytes
SHA-256: a1240296162831b6fefbbc60fe0552e5f8bc51aed0e69eea4849757b888bbb64

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