Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0c0c3b4cd7542d…

MALICIOUS

PDF

98.0 KB Created: 2021-07-06 08:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9549d51e2ae4d91036e8bbc6668d73ae SHA-1: 9fa2e0f447b57e0932f01a56a559611e58ea90c9 SHA-256: 1c0c0c3b4cd7542d50bbd2e5a4daf0b8bea0e1290493ef772ba6b91c5fa0066f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, indicating a likely phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e6c8d0219b1a743d682c61ae53e93efd/99653532795.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4nq5t4d7fpjo32ibv67uuom4d7/41630594293.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/midojexege.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cabfe0b96f3---budibiwixap.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4ca2bf32---veduxigeri.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/t3gehka0qs3i8ibj2ipln2bun1/goxekiwa.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629b3318d8---rokofisuzojovizoxefatu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a5fbe0585db1f82f2d1151c767729d72/zuxatosiwukeluzuwu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2b25adb3aa2949780c4d1d3bb37f160/tovavafatenatinusuwi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e8e77e22ffc57afe56609535c36e012b/40195295313.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/jetesuxu.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210616091839_gz9m0a.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/karakoluwedamuzux.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5c4bc2b9---80302651908.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b54376ad---27228545984.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e756c69de---31871335577.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/775ce01e8784ddf7540b5ed0b34e812b/tudapevoxofekuwenodemefo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160723085466e3---17165124947.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afe027cef71---57240346048.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ts0h2evp1btecp308pidsjgbuo/sipikotu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/26059b1689f2942fdb6c3b4558170786/narotelopumitikiminanebej.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hoe27nvqpvis8go4in3dq2133m/39852382400.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09fbbccc6---33247696984.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/59840108115.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/99833791211.pdfIn PDF document text
    • https://actorconseil.com/files/file/dukupiwebirawivezupoture.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/logeledekavemupakebes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=anime+like+code+geass+and+death+notePDF 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_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 17900 bytes
SHA-256: 9020be51b6144b5df22fb301e995141061e97d8e843a2dce617815e0323a21bc
font_01_sfnt_off000149fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16212 10788 bytes
SHA-256: be5f47e53f6d462baa7f142548e10b869bb12ab81480494a7b6485d706d51001

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