Malicious PDF — malware analysis report

Static analysis result for SHA-256 9070abfd9379c5df…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 00:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 33b9921e4e85ec81c6dea4a115cd4424 SHA-1: 53c8e9c95ae7f6ecae29c9af5266d54af8c65657 SHA-256: 9070abfd9379c5df14a42dd3ad32c3460bbf12b1f1fefec76cf2ee2f1e4f8b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd891c5f42---lajejorudutadodilo.pdf In PDF document text
    • https://talenthunt.biz/userfiles/file/22946687236.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/delusufexaregimezuwewe.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/lulabefu.pdfIn PDF document text
    • https://protum.se/file/11262369344.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/76352677002.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/9986435301.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/tidogeberov.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/xofiruka.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20014583837.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac455cf04---givaferowifigovupolozurat.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/bekewogakisolemoba.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f3c7abde---77504916549.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/kenepipodajun.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/56126494756.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134a00540452---69794519640.pdfIn PDF document text
    • https://kimansion.com/uploads/file/11681147298.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/2460434660.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/63405005218.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/93655347258.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f1aecff7---duvapiwarunimoruxur.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161425f014f24f---3538967509.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/xalegasavarozet.pdfIn PDF document text
    • https://kar360.com/resimler/files/lixonekaripuvonubim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=picture+frames+app+for+androidPDF 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_off0000bbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB1 16060 bytes
SHA-256: aad6d313121b230130d9cf1d6cfebdd042e72fb82054208668bca9eba9890980
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10836 bytes
SHA-256: 457c740f3c5aaef74133b467e1560d9618a2f7e204630ebe9dac037e61bdbd78
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1