Malicious PDF — malware analysis report

Static analysis result for SHA-256 9230aec4ce0eb201…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 08:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1656d36aa8cee0fb2495fc96273d58b2 SHA-1: f82cbfe36d1f4ecd2867878dc5a62016ef477500 SHA-256: 9230aec4ce0eb20149d9bca1bf5a5c89d25d5e442c6042e6de9666a8fe778571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+to+undo+latest+android+update PDF link annotation
    • https://saptabangunmanunggal.com/indomobils/upload/file/83448769431.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/zepotolorufisupe.pdfIn PDF document text
    • http://www.pvvc.cz/files/82110442211.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161484b94c5757---58017080417.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d869b7bfdc---bikawuzojanoburiwefom.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/sopuxojaf.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/31090549497.pdfIn PDF document text
    • https://shunnasato.com/69621370137.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161497326086d2---94344267130.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/10094177301.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/varofigikezopefevav.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/lebosanog.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/naridibisaposimuw.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/dazinuvi.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/xasuwadojajeku.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/jemudetubutexonilegoki.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/filimolebobaxixa.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wigukilire.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/31869902146.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61255755768.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aef6d647a6---mexalasaxofiw.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/11239102963.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/zulidaripawovoxaponoxosi.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/76455176410.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56535310494.pdfIn PDF document text
    • 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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 10564 bytes
SHA-256: 75d9f00da9bffd5cb33a14d77f20167e5953a8eeb4b876669f10964732a4065c
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 17568 bytes
SHA-256: 433d58018f00226fa7af8d57204d6cb9dc3f41591aeb1ba68cdfb3dbfc2990d9
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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