Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d53dce1b807876…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 21:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d56fa819aaa91ef95f62f13d9f4ad98c SHA-1: c2c1032bbd65e445a23a4233f476274c3801c21a SHA-256: 67d53dce1b80787608ed05c3ea4d1d7e0cfff4883408cdda55e7baf7fc599cc7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e22777b4---tifajo.pdf In PDF document text
    • https://worldtradezone.com/userfiles/file/mawimolexagosinexivinem.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/19688195981.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/zekelite.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210902_234818.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/dixodeniguxasepe.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/leletuti.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rurojikun.pdfPDF link annotation
    • https://hobbes-group.com/upload/files/tetemalamekosogug.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/35758037502.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/godotefopezuvekavimij.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/45547287082.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910040422709853.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wonesosi.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/vaxoboxobutulebido.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/pusewezapef.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613508e6df096---93212883770.pdfIn PDF document text
    • http://aven.su/userfiles/file/69344583817.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ef27a93e029befbca92b0b3d16cc91f/xukuranelolovuforonalu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nagurusakukolomopulof.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/61898791546.pdfIn PDF document text
    • https://ismart99.net/upload/files/bukapurivorixavi.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/duwunopiro.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/zevijalaxurefik.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136268a6734e---remixinebov.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e26059e05f45e3bbdb78a3fa1fbdbb76/27262286138.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/badenivonajezipenamexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+rid+of+voicemail+on+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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 10796 bytes
SHA-256: b7f9c90329b8501a5d6ae146841e331d4c026879dc25bf9f27c220159005d9f3
font_02_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 18452 bytes
SHA-256: e838834c3afdf60f49de330ffbae7e9df5b65c57abafcce17736e8ad50661418