Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7676c4176cdd9a…

MALICIOUS

PDF

85.5 KB Created: 2021-08-09 04:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31ccc0f8caa5ecdb8132b2122a971344 SHA-1: 88ba5eaf9f936c3359f89fd98a8d247d02d6f2bb SHA-256: 3b7676c4176cdd9a88c81510afd47e6b3a49968381427a785c8e82aebcd1705e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://airholic.com/UpFiles/WebEditorFiles/file/guzisalap.pdf In PDF document text
    • https://negaratoto.com/contents//files/46257913568.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/39363551169.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/xesibe.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/xuseku.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac4ed9709---tirofezokafomanawu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gapigenebedegirirerogar.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/luveramudumop.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d1251a8fdbd3658744e08d66d7d2744a/pikoruvariwil.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i4mslgm842mdnherbfseh1lec5/98138574111.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b56b2a25e9---vugegaxivarobulo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9ceabbea---gigositoti.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/apqhtldkcasshgr04hhhil09c1/96635817295.pdfIn PDF document text
    • http://usateatop.com/_upload/files/94047721630.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a096bc95845fdf306df344aa40c1230a/46241085432.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wuriki.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a447b0f5346c2c0a49873ec535ff4e4d/23259534549.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55202285970.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/dijeletadozalaji.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/34456044476.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71d396dfce---funafekosujaxalababiv.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/55128354700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=intermediate+accounting+3+millan+solution+manual+2019PDF 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_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 11400 bytes
SHA-256: d58cac7d6cacd60e9e8f92e3a467efd7255c82a1d121514bce294b37ed6885db
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 17168 bytes
SHA-256: 1c5d29ed1d545d50e6bf72311de00cd208ae7a6cdb0dc47d19ab033ffadaa02b
font_02_sfnt_off00012fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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