Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a2a23dadf8f83…

MALICIOUS

PDF

75.4 KB Created: 2021-08-30 22:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37a9388cff252fd943961db6a1e6ffe2 SHA-1: 51948bb946940069a921375482947625da93d115 SHA-256: a90a2a23dadf8f835a144c2c0680b99afbeeaab9bd3b32975a56e2aa39482a07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories. The presence of JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload or redirect the user to a phishing site. The link farm further supports a malicious intent, possibly for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eschool365.in/js/admin/uploadfiles/file/merel.pdf In PDF document text
    • https://777mto.org/contents//files/kazatipewivebatuwix.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/33580738837.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/pinejesu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699089d860---95054502551.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/ledowoxibolup.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/41b196c688c8ed6e7c05501112ae57c4/vuborurasetuwoguregenukex.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0e7a3a3d208f6a23852f7f5699f4a279/82399097324.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4b4f05aa---85259875500.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/60525768533.pdfIn PDF document text
    • http://hmed.vn/upload/files/35699131068.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/14/file/20210814_014845_181.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/kupuwovo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ed06816fa6bfdda52d56eca671b04d94/3496605675.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dfe1d25c---lobivunadimugutazadutov.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/36008003289.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rugetetugepabuxepime.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eee8d980b---93950547117.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c46fb64da---4308106980.pdfIn PDF document text
    • http://keacg.com/upload/files/60615380541.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/puvefifelavor.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qscc6bkfnmellgsrtqm7rf48aa/28725552813.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7662bca40---75836980682.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9b9965a0d---87191208381.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vatifomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=quick+party+snacksPDF 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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 10436 bytes
SHA-256: aa414d8588ba63ab5f43358db65b26a923cdd568eb6a550fdaea815fea900bbb
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 17128 bytes
SHA-256: d4b2a82bd2c8aea6bc17a7acb08cd70193dd1748cfa200441b5bbf00beaa51ea

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