Malicious PDF — malware analysis report

Static analysis result for SHA-256 427967ccc9187e5a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 12:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3503cbc74bfee2bd39ff836b0e90d307 SHA-1: c26433458aeaddf57119dae7d15b64592b335d2b SHA-256: 427967ccc9187e5a22c1e2bb1299bbca3e4b335cfae0dbecf59cc34e858e5ea3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious hosts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://viswinkelindex.nl/images/uploads/mesalakiratobinolorojozi.pdf In PDF document text
    • https://hirurgija.me/files/78724204518.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppfr7lng26gmoifs3su2fenif3/kukufitezedibuxajosire.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/babatufefojodopekoxawagim.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/mokorerigodi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/pitosomabifolagazisotup.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12158285596.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/winizibeloti.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/debulofozijopibone.pdfIn PDF document text
    • https://10fci.org/userfiles/file/gorutupufimef.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad7e039d3---40953702448.pdfIn PDF document text
    • https://datajournonepal.org/files/vajorixopesimir.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd70b459e---53730862622.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/dopiguxavu.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/gogatadiwit.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/53334587412.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/denedajula.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/75857162685.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/39865904093.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5298c9fac7005632e1fa9fc9a3ef9ac4/xebaduzoludedu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/62094177329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+change+text+notification+sound+on+galaxy+s10PDF 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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 11224 bytes
SHA-256: 62ae444c06864c3a0cc8b6570b8f9fab3ab55bf4a793f1d1a5a076fa73d5002c
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 17956 bytes
SHA-256: 19607409d7363bd672b2a1e7107b1c2b9d7fbbff4eb2335b0874704544df4b95

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