Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b022eee6ff90da…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 23:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20ad1e2179f22581e606153d8dea64c5 SHA-1: 367bcf896e6dc89eebce346820bf6f19391dc9db SHA-256: d5b022eee6ff90da313bb2fa0f87dee502dfda484f9359f3e451364e1ea845db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://chapelguild.com/images/usr/fotedebomizomani.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/925eccd54389757d961200b2819e92f4/wiwijusi.pdfIn PDF document text
    • http://lg-palette.com/upload/files/48615973899.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c72ccb32b---61175001560.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55dcdcedcf---nesojapekorawawitejeb.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/53289957939.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c49263f05a3---45474335453.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/dumogifuloka.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e1ceffc163a7fba6f7a92c4eded8d288/bijesuponi.pdfIn PDF document text
    • http://pb-book.com/user_file/file/ziduvifetaliraridekito.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/bigebuxoloparuxadokun.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20218122146468934.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/rufumipusovixejirivuf.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b6164d14---zagazowej.pdfIn PDF document text
    • http://abnicum.com/files/file/35395944543.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/rojabogeb.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/43776731934.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/63912147473.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c15a840fbf11ee3b403d386ceb85517a/27622189964.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/dilonijilepilebi.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/gusipezimu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/3435759310.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/tazifavakafego.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/15661440501.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/95436790440.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/sesiga.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/35213325637.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/waleke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=skripsi+uin+walisongo+pdfPDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 18164 bytes
SHA-256: 0a34266d8ce5e4c069f2bf71525621e0976cee766c912d943e622a2d59aa1070
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 10796 bytes
SHA-256: 09d80dff69d3ca0c8a898366daf5061c5b3b1538db5bcae5ca4e98874e74ae16

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