Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff4a0ba950c3db9…

MALICIOUS

PDF

68.2 KB Created: 2021-09-22 17:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8574011f2ef3ef194e483dc234f4a09d SHA-1: b4edf7b7d33c16db8c36600c29008139d6d5a3be SHA-256: 3ff4a0ba950c3db97b2f95fd4ce192a4602000161f50d813a04346e5a0a83705
164 Risk Score

Malware Insights

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

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate the document is part of a link farm pointing to potentially compromised or disposable hosting, likely to redirect users to malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://voyagevietnamlaos.com/hinhanh/file/2806714094.pdf In PDF document text
    • http://iraneto.com/basefile/iranetocom/files/4538752209.pdfIn PDF document text
    • http://eichler-kammerer.de/79303739453.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/belinagolava.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/92392139328.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/wujuximebevutotap.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/55525061210.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/disazagawofebowobuzej.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/4909123657.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/29960617082.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf328bc29---lebokugatokanipuv.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/mimelomaj.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/71396562581.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/fower.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zedidupupidawox.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/34381273840.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/29072113411.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090709195892.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/28954057404.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9f7ba25a0939c0cf44702c58f4cce69c/41125248569.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b616e2a235---68104867196.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/92030313059.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/jasebafebefanet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=noizz+app+without+watermark+free+downloadPDF 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_off0000ad93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 10912 bytes
SHA-256: a8233638cad0c4586171459a92eae188bd0fe9e7f3d2230b319fa93351284e90
font_01_sfnt_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 14868 bytes
SHA-256: 1070654f2f0321149a195d5d533c1be7677eb9be656bcc91714586f89c1993e9
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1