Malicious PDF — malware analysis report

Static analysis result for SHA-256 9035666f1775af0f…

MALICIOUS

PDF

94.6 KB Created: 2021-08-13 12:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd16f6020df65cb5f6aafde285605462 SHA-1: 7f67327591709a222e8192fea1a862808f031d81 SHA-256: 9035666f1775af0fa56dee683c981d17c23e2d54711ed86cafdc721333459e83
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://eprobatdz.com/ckfinder/userfiles/files/53703474902.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6bf0a4f2---lafiwifiwuvizisul.pdfIn PDF document text
    • http://santabruna.cl/upload/file/96264151917.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/damej.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/darinaxuralasefawafopem.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/36318855511.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qt2bon3npspj2a9ec4m5882q32/79882323570.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d6be66a8b0008666ac348bbbf488c72b/mutikavowoduzifojazet.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/64887629421.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/46537098934.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160778f6d2ee18---pifalokuxovetipemeg.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88a34412a34f0c2c644798f2d0623caf/60665250676.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/15351706562.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31d62318b---zufetirisatomazebedav.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/8535471f3923ecc8ed53b69ac7cbf4e4/fekuwivalitukogikewogunu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbc09d884e---22044119924.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ebd5bc38787791d12ed086f6b5c614e9/vaduzeviwepumewe.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/beruzamezurubowoxida.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d01cd06c---mezogerofisisir.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/426ae6799bdb961a77d093007d2f0afd/67605140527.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/kutuzerewij.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210621050955.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/59647726308.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/skoefn1er9i9nnkic7ak7gehl3/kowopolipejokudokipuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+jbl+flip+5+speakers+togetherPDF 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_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 11332 bytes
SHA-256: 7ce17629fca2a08897f47595e9117cfdd611eb4feacca48386905069cbb4c4c2
font_01_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBB 18600 bytes
SHA-256: f992d07f2d784edbaee7ba18da03099178d7b38cf4b06d74ee90b81d58f8dd51