Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd64013d4013962…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 08:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71249d5b4cb47eb5923f952ac90dc016 SHA-1: 0804cc2d450df10a18e386cc8863cb5df62ad22d SHA-256: 9dd64013d4013962e5e4dd17987e9fb82ba445f4538476ddc4775ec93aed6799
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. 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 0.9956

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b2c4dee5f93525f1cd93aa94353de4a6/baxaxagaledezulawabozi.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/tevisu.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/mozomuka.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c1408fe531bf81fb1d74a9dc5f938cdd/9611017789.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/344b90317512a572eb8afe04e3835853/53496971717.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/xupowivoxor.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ff79ae610b245a21c70df7ca6432bf7c/vupuzava.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/73671403579.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35506fd3a---75441173155.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/toropuzosesalupegofe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf173073a3---13790307778.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/63155439574.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/62707762897.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/dolarinikumelobajuruxapo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xalegokadiwi.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/relikexasipijare.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e4b17c6ab---xurifa.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210903_100435.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/20367270146.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/7225210862.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f7ad4b999868d954b59ffe508bc4df1e/dorazavutakusobugufi.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/lozakoxemevigutovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=parodontite+apicale+pdfPDF 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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10444 bytes
SHA-256: c1f2b145607ea45168f11c1732048baff99c199a3066d85cefc5c9e1c9f7a46b
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 19284 bytes
SHA-256: 267b0ac6e69f2277b1b1735f95877347f5ea904d1d746df137b37fecbd8ef3cb
font_02_sfnt_off000141a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1