Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c59f86513595fd1…

MALICIOUS

PDF

90.9 KB Created: 2021-07-20 06:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2703c0bd597d543b1b97b41d9f733e35 SHA-1: a62f6aadb3c36fff616d28f7825a5aa66f9be2ae SHA-256: 4c59f86513595fd1ad6ca619d016efbfcf0c137a77454fb3739fa7b3d24e8f90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV and ML classifiers identify this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple compromised CMS upload links indicates an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a2445975c1c9743afa84c232b2ec737/xonurisobimonanada.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf17a346ff---17635508523.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dea67d90---34496196820.pdfIn PDF document text
    • http://topas.lt/userfiles/file/zifurigenolo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5vu6ppmuv4dhd5iapi32d59luc/vugaziwalu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0581acedc8---10127493454.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607303795353e---24122613883.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c228e3553a0380db578d3ca5c880424f/letonerabogexefajumip.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160986fc8ef650---4151734448.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/gudeluzukusiwetesob.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/dogexofimalawewuwesolured.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/86874834665.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1538f6ac---68900802037.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/97990487437.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083892375e75---kagevuroxadajutedowesuzan.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/61283198435.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/lepifenog.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e8115e29575ebe4827a7ec74346b8652/golaxib.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3fae5829ba49f3020d82ef76bfcf3f56/45283175453.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/gowizabaramomuparetema.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160840b84b2dc6---14046062786.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/fuzenijozapifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=before+the+wedding+night+bookPDF 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_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 17336 bytes
SHA-256: 81e822c1864a9c8fcf70ea18369a202a1c100ee4854eb07a786824f46cf46e2c
font_01_sfnt_off00012e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 10628 bytes
SHA-256: 3b81d7dbc20267c3082b7c06de6d22b992f2fe6a6e9214c3e573ba1fa8bb2638
font_02_sfnt_off00014688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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