Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f664a7febf370f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b60ea6e1eef6cb652c66532a944c0552 SHA-1: 6a6a7e1b67bf7f00f2b08258361ecdfc3f6b5418 SHA-256: a1f664a7febf370f517739d746574b94f2e6f2cf7a3e2c18f468d5d0b27a0de7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=death+run+3d+apk PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136946857c50---lavumodosatuxesazaj.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/72436062209.pdfIn PDF document text
    • http://bndweb.nl/upload/files/gigibisaz.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113d3eb629---39757194148.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/nozuxujip.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/dadonuboxajepaxik.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/72586449767.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gogorozubud.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/88796600823.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/rojusebinubipuvere.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/85446369433.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/surinuvovagamijo.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dagazikukelozopuluj.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/nisodanojavos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141142fb2c64---94708456208.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/befawejideludonije.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_7CA2FA9C7AFDC897.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/nawagotobojudepafupuvik.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/labijud.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/84356139141.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/pariruwelabegevadutif.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/kojevazoxikamojagukigumam.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/83044899505.pdfIn PDF document text
    • http://meditopthailand.com/file/luwojisin.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161325618bacbe---rifijis.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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 10428 bytes
SHA-256: 9cad2c340f6440881fdaa303e88ee22536c39016c2fa671e3a350a2236767cc3
font_01_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 17644 bytes
SHA-256: 99e67206cf96b443f9301701e7f6c0653a1b4097406e02b9274fe2eef360cc75
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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